1 . Don’t talk loudly while having meals in public places, ________ you’ll be considered impolite. （用适当的词填空）

2 . There is a danger of entering a cycle of highs and lows______more and more comfort food, high in carbohydrates, needs to be eaten. (用适当的词填空)

3 . The experiment allowed students to get a taste of_______it was like to live in outer space. (用适当的词填空)

4 . Finding her car stolen, ________.

A．a policeman was asked to help	B．the area was searched thoroughly
C．people around all came to help her	D．she hurried to a policeman for help

6 . Sales director is a position ________ communication skills are just as important as sales skills. (用适当的词填空)

7 . Occasions are quite rare ________I have time to spend a whole day with my kids. （用适当的词填空）

8 . ________ is often the case, many animals sleep a lot when young, but sleep much less when they get older. (用适当的词填空)

9 . With more and more forests being destroyed, huge quantities of good earth ________ (wash) away now. (所给词的适当形式填空)

10 . As the human population ________ (continue) to grow, so does the effect we have on animals. （所给词的适当形式填空）