Read the following article and select the best answer. Article: It just may be the world's most costly vacuum cleaner ( ). The price of CleanSpace One is eleven million dollars. But yet, it has a big job to do. Recently, researchers in Switzerland said they planned to build this new cleaning machine. CleanSpace One will not be for use in homes or businesses. It will be shot into space to help remove thousands of pieces of space junk floating around up there. Last year, we reported on the problem of space junk. Over time, many unused spacecraft have hit each other far above the Earth. Big pieces break into thousands of small pieces. Sometimes they fall back into the atmosphere and burn up. But when they do not, it creates big problems. Scientists fear that if something is not done to remove these objects, it may soon become too dangerous to send people and machines into space. There is a large chance that they might hit some of this junk. So that is why the Swiss researchers are developing the new machine. CleanSpace One is not really a vacuum cleaner. It will not be used to take away space junk. But scientists plan to move it close to an old satellite that is no longer being used. Then a claw-like instrument will catch the satellite, and force it back through the atmosphere. There, the satellite will be destroyed by the heat of friction with the air. Researchers say that all they need to do is slow down the speed of some of these unwanted objects. Once they begin to move more slowly, they will fall back to the Earth. There is little chance that they will fall through the atmosphere and harm the people or things below. Question: Space junk is created when _ . - unused spacecraft hit each other - people in space throw away rubbish - a new spaceship is sent up - an old spaceship creates friction with the air
unused spacecraft hit each other

Read the following article and select the best answer. Article: (RAMALLAH, West Bank) -- Israel freed 26 Palestinian prisoners early Wednesday, the second of four groups to be released as part of an agreement that started the current Israeli-Palestinian peace talks, which had broken down since 2008. In all, 104 prisoners are to be released in four rounds over the coming months. In the West Bank and Gaza , the mood was overexcited as hundreds of Palestinians welcomed the prisoners back home, after many had spent more than 20 years behind bars. Crowds of people rushed toward the 5 prisoners released to Gaza, raising them on their shoulders, waving Palestinian flags and dancing to music. Relatives held signs that read "we will never forget our heroes." More than 2,000 people welcomed the 21 prisoners released to the West Bank, who were greeted at a ceremony by Palestinian President Mahmoud Abbas in Ramallah. Hazem Shubair, thrown into prison in 1994 for the death of an Israeli according to the Israeli Prison Service, was over delighted upon his return to Gaza. "I am speechless," he said. "Thanks to God. God is greater than the aggressors (meaning Israel)". Abbas said a final peace agreement with Israel was possible on the release of the prisoners. "There will be no final agreement without the release of all the prisoners," he told the violent crowd. Israel's Supreme Court earlier refused an appeal that intended to cancel the prisoner release. An organization of bereaved families behind the appeal has said it fears the prisoners, all in connection to the deaths of Israelis, will return to violence once freed. Question: There will be no final peace agreement between Israel and Palestinians until _ . - all the Palestinian prisoners kept in Israeli prisons are set free - all the prisoners return to violence once again - God is greater than the aggressors - Palestinians welcome some prisoners back home
all the Palestinian prisoners kept in Israeli prisons are set free

Q: Read the following article and select the best answer. Article: A young father was visiting an old neighbor. They were standing in the old man's garden,and talking about children. The young man said,"How strict should parents be with their children?" The old man pointed to a string between a big strong tree and a thin young one."Please untie that string," he said.The young man untied it,and the young tree bent over to one side. "Now tie it again,please," said the old man,"but first pull the string tight so that the young tree is straight again." The young man did so.Then the old man said,"There,it is the same with children.You must be strict with them,but sometimes you must untie the string to know how they are getting on. If they are not yet able to stand alone,you must tie the string tight again.But when you find that they are ready to stand alone,you can take the string away." Question: When can the string be taken away? _ . - When the old man has left - After you have untied it - When the young man has untied it next time - When the young tree grows strong enough
A: When the young tree grows strong enough

(Q).
Read the following article and select the best answer. Article: Trees should only be pruned when there is a good and clear reason for doing so and , he number of such reasons is small . Pruning involves the cutting away of overgrown and unwanted branches , and the inexperienced gardener can be encouraged by the thought that more damage results from doing it unnecessarily than from leaving the tree to grow in its own way . First , pruning may be done to make sure that trees have desired shape or size . The object may be to get a tree of the right height , and at the same time to help the growth of small side branches , which will thicken its appearance or give it a special shape . Secondly , pruning may be done to make the tree healthier . You may cut out diseased or dead wood , or branches that are rubbing against each other and thus cause wounds . The health of a tree may be encouraged by removing branches that are blocking up the center and so preventing the free movement of air . One result of pruning is that an open wound is left on the tree and this provides an easy entry for disease , but it is a wound that will heal . Often there is a race between the healing and the disease as to whether the tree will live or die , so that there is a period when the tree is at risk . It should be the aim of every gardener to reduce that risk of death as far as possible . It is important to make the area , which has been pruned , smooth and clean , for healing will be slowed down by roughness . You should allow the cut surface to dry for a few hours and then paint it with one of the materials available from garden shops produced especially for this purpose . Pruning is usually done in winter , for then you can see the shape of the tree clearly without interference from the leaves and also it is very unlikely that the cuts you make will bleed . If this does happen , it is , of course , impossible to paint them properly . Question: Why should running be done ? - To make the tree grow taller . - To improve the shape of the tree . - to get rid of the small ranches . - To make the small branches thicker .
(A).
To improve the shape of the tree .