第I卷：选择题 (共60题，满分75分)
第一节 单项填空（共25小题；每小题1分，满分25分）
1 .When the cooking class changed to Thursday, I had to ______ so that I could pick up my son from his piano lessons.
A. drop in B. drop off C. drop out D. drop by
2. When he was 20 years old, he __________ doctor in the village.
A. become B. turned C. grown D .changed
3. —Peter , where did you guys go for the summer vacation ?
—We _____ busy with our work for months, so we went to the beach to relax ourselves.
A. were B. have been C. had been D. will be
4. His teacher is the only one ______ he can turn when he is in trouble.
A. in whom B. to whom C. for whom D. from whom
5. —How about camping this weekend, just for a change?—OK, ______ you want.
A. whichever B. however C. whatever D. whoever
