user: Question: Read the following article and answer the question. Article: Three boys, Tom, Sam and Jim bought seventeen apples. Tom wanted the half  . Sam wanted one-third  ,and Jim wanted one-ninth  * But they didn't know how to do. Just at that time,a little boy came with an apple in his hand. The boy said to them, "Don't worry. Let me help you" Then he put his apple into their apples, and made the number of the apples eighteen. Then he gave Tom nine apples, he gave Sam six apples,and he gave Jim two apples. He gave away seventeen apples and took his apple back. The three boys were very happy. And they said: "How clever the boy is!" ,. Question: There were  _  apples when the three boys divided them. Answer:
OPTIONS:
- fifteen
- sixteen
- seventeen
- eighteen
Answer: seventeen

Question: Read the following article and answer the question. Article: (C)The earth is not only, but also thirsty for water. This may seem strange to you. because nearly 70% of the earth's surface is covered with water. But about 97% of that is sea water, or salt water. Man can only use the other 3%--the fresh water from rivers, lakes, and other sources. And we can't even use all of that, because some of it is in the form of icebergs and glaciers . Even worse, some of it has been polluted. However, as things stand today, the fresh water is still enough for us. But our need for water is becoming larger and larger quickly--almost day by day. We should take steps to do with this problem now and in this way we can get away from a serious world-wide water shortage later on. We all have to learn how to stop wasting our _ water, one of the first step is to develop ways of reusing it. Today in most large cities, water is used only once and then sent out into a sewer system , from there it returns to sea or runs into underground  places. But even if every large city reused its water, we still would not have enough. All we'd have to do to make use of sea water in the world is to remove the salt. Question: The earth is thirsty for water because  _   . Answer:
OPTIONS:
- man has not enough food to eat.
- we haven't had enough fresh water
- only 70% of the earth's surface is covered with water.
- more water is sent into the sewer system
Answer: we haven't had enough fresh water

Question: Read the following article and answer the question. Article: We've talked about snails   and their slow move. But much of the time snails don't move at all. They're in their shells ---sleeping . Hot sun will dry out a snail's body. So at the least sign of hot sun, a snail draws its body into its shell and closes the opening with a thin cover. Then it goes to sleep. A snail will die in a heavy rain. So whenever it rains, it goes inside its shell house and goes to sleep. A snail can sleep for as long as it needs to. It can take a short sleep. Or it can sleep for days at a time. And it spends all the winter months in its shell, asleep. In spring the snail wakes up. Its body, about three inches long, comes out of from the shell. When hungry, the snail looks for food. It can't see very well. Its eyes, at the ends of the top feelers are very weak. But its sense of smell is very strong. It helps the snail to the new greens. Then the snail's little mouth goes to work. A snail's mouth is no longer than the point of a pin . Yet it has 256,000 teeth! The teeth are so small that you can't see them. But they do their work.. If you put a snail in a hard paper box, it will eat its way out. And if a snail wears out its teeth, it will grow new ones. Mostly, a snail looks for food at night .But on cloudy days it eats in the daytime. It eats all day long. A snail can go on eating for hours and never feel full. Question: In the sentence "A snail draws its body into its shell" the word "draw" means  _  . Answer:
OPTIONS:
- to make with a pen
- to keep away from
- to pull
- to move to end
Answer:

assistant: to pull