一、单项选择 (本大题共30小题，每小题1分，共30分)
在每小题所给的四个选项中，选出可以填入句子空白处的最佳选项，并将答案写在题前的括号内。
1. — _______________?
— My car doesn’t work.
A. Why are you here ? B. How do you do
C. What’s wrong? D. What’s this ?
2.—You _______ write him a letter to say you are sorry for it.
—I ’m not good at writing letters. I want to talk about it _______ the phone.
A. should；in B. could；on C.can；over D.must；by
3. He used to ________very late, but now he is used to __________ early.
