The writer didn't think the young man looked familiar.
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1. I ____ the letter when she called.
A. was writing
B. write
C. is writing
I was busy yesterday. I____ for the exam.
A. prepare
B. was preparing
C. prepares
I didn't know you ______ for me all the time.
A. wait
B. are waiting
C. were waiting
The problem is too difficult. ______ can work it out
A. few students
B. Some students
C. Many students
D. Few students