II. 单项填空（共15题；每小题1分，满分15分）
从A、B、C和D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
16. Our teachers always tell us to believe in ________ we do and who we are if we want to succeed.
A. why B. how C. what D. which
17. The problem of global warming is serious.______, the sea levels have risen a little.
A. As a result B. On the contrary C. In a word D. In other words
18. Safety ___________, the Chinese in Libya could go to the embassy to_____ help.
A. permitted; seek B. permits; find C. permitting; seek D. permitted; search
19. Why ________ you always play the piano at midnight?
A. should B. need C. must D. can
20. The earthquake in Japan ______ the tsunami, three days after which, a baby was magically found alive while her village ______ in ruins.
A. lead to; laid B. led to; lay C. accounted for; lain D. accounted for; lied
