TASK DEFINITION: In this task, you're given an article and an answer. Your task is to generate the fill-in-the-blank question for this answer based on the given article. The blanks are always at the end of the question, and can be filled with more than one word or phrase.
PROBLEM: Article: If you feel at present that you don't have enough friends in your life,one reason may be that you have let yourself become too busy to make time for the relationships you already have.Starting and keeping friendship requires effort and commitment. Many of us let our lives become so busy with work and other commitments that we don't get around to scheduling time for pleasure and renewal with the friends,relatives and acquaintances we already have. Making the effort to call your friends more regularly and to accept more of the invitations you receive from others can improve your social life in a hurry! Are there any people you could call right now and be assured of a pleasant welcome? Are there people that you could count on to help you in time of difficulty? Can you have close talks with them? Do you have fun when you are together? Are you happy to have them in your life? If you haven't seen much of them lately. is it because you have become too busy? Have you grown apart? Was there an argument? If the main reason you haven't been getting together with the people you already know is that you have gotten too busy,take a good look at how you spend your time.Compare it with your real values and priorities in life.Is your busy lifestyle really bringing you the quality of life that you want? If you have become too busy for friends,why has this happened? Are you seeking material toys in your life at the expense of relationships with other human beings? Have you allowed your time to be over.committed because you never say"No"to anyone? Do you insist on doing things yourself that could be delegated to others? If so,why? Do you believe that everything depends on you? Examine whether the way you are now spending your time accurately reflects your deepest values and priorities.Make sure that you schedule enough time for the things that are truly most important to you. If you really want to keep friends in your lire,make a space in your schedule,and a space in your heart for them.
Answer: how to balance friendship and work

SOLUTION: In this passage the author mainly discusses_.

PROBLEM: Article: At night, bats fly through the air, catching hundreds of insects and other small animals. But during the day, they hardly move at all. Instead, bats pass the time hanging upside down from a secret spot. There are a couple of reasons why bats rest this way. First of all, it puts them in a position for takeoff. Unlike birds, bats can't fly into the air from the ground. Their wings don't produce enough lift to take off from a dead stop, and their hind legs are so small and underdeveloped that they can't run to build up the necessary takeoff speed. Instead, they use their front claws to climb to a high spot, and then fall into flight. During the hours when most enemies are active, bats gather where few animals would think to look and most can't reach. This allows them to disappear from the world until night comes again. There's also little competition for these resting spots, as other flying animals don't have the ability to hang upside down. Bats have a unique physiological adaptation that lets them hang around this way without using any energy. For you to hold your fist around an object tight, you contract several muscles in your arm, which are connected to your fingers by tendons ;as one muscle contracts, it pulls a tendon, which pulls one of your fingers closed. A bat's talons close in the same way, except that their tendons are connected only to the upper body, not to a muscle. To hang upside down, a bat pulls its claws open with other muscles. To get the talons to take hold of the surface, the bat simply lets its body relax. The weight of the upper body pulls down on the tendons connected to the talons, causing them to hold tight. Therefore, the bat doesn't have to do anything to hang upside down.
Answer: they can't start to fly from the ground directly

SOLUTION: Bats hang upside down because _ .

PROBLEM: Article: Global warming has a great influence on species all over the world. Polar bears are particularly at risk because their habitat is increasingly threatened by global warming. Lots of scientific research has shown that polar bear numbers are on the decline, and that if action is not taken quickly, polar bears may die out from the Earth. Pack ice is decreasing globally. In the wild, polar bears spend much of their lives wandering pack ice in search of food. In 2009, several polar bear deaths by drowning were recorded, which had never been heard of before. The polar bears had been trapped on isolated areas of floating ice, and had tried to swim for land. Due to the shrinkage of the ice, the polar bears tired and drowned before reaching the shore, though they are rapid and aggressive swimmers. This problem will only grow as the pack ice shrinks. The shrinkage of the ice has other consequences for polar bears. They are losing their natural prey , who are also affected by the shrinkage in habitat. Land animals also do not provide the high-fat diet that polar bears need, which will lead to starvation. Starving mothers will not be able to provide their babies with the nutrition they need, which will further contribute to the decline in polar bear numbers. While searching for food and habitat, polar bears have also fought with humans. With the disappearance of the sea ice, polar bears have begun to show up around inhabited areas looking for food and shelter. But they often end up being killed by hunters because they present a threat to human communities. The combination a deadly factors brought about by global warming put polar bears at a very high rate of risk. A global effort is needed to act against global warming before it is too late for polar bears, as well as many other species that call Earth home.
Answer: they were seriously hurt when hunting

SOLUTION:
The reason why several polar bears died in 2009 is that _ .