从A、B、C、D四个选项中,选出可以填入空白处的最佳答案。
(   )1. —You’ve dropped _______ “f” in the word “afford”.
          —Oh, sorry. _______ letter “f” should be doubled.
A. a; A       B. an; The    C. a; The     D. an; A
(   )2. You must ask for _______ if you want to leave early.
A. reply   B. answer   C. permission    D. matter
(   )3. The bridge is almost broken. _______ is not safe to cross the bridge.
A. That       B. This      C. What       D. It
(   )4. There is only one seat left. _______ you _______ your wife has to wait.
A. Both, and       B. Neither, nor
C. Either, or      D. Not only, but also
(   )5. —How does your sister learn Japanese?
          —She learns it _______ listening to the radio.
A. on          B. from         C. with        D. by
(   )6. _______ the end, they arrived _______ the morning of June 22, 2005.
A. In; on    B. By; on   C. At; in      D. On; in
(   )7. —I’m very sorry, Bill. I’ve taken your shoes _______ mistake.
         —That’s all right. After all, we are good friends.
A. on         B. by       C. from      D. with