Ⅰ.用所给词的适当形式填空
1．Mr. White ______ just ________ (buy) a recorder for his son.
2．She ______ (be) here just now.
3．My mother isn’t in.She ________ (go) to the theatre.
4．________ you ________ (see) Mr.Smith recently?
5．My mother ________ (wake) me up when she ________ (hear) a knock at the door last night.
6．Great changes __________ (take) place in China since 1978.
7．I hear that the famous singer ________ (be) to America several times.
8．I __________ (receive) his letter three days ago.
9．He will come as soon as he __________ (finish) the homework.
10．If you ____________ (read) the magazine before I leave，please lend it to me.
