四. 语法应用 : Model verbs.
1． Michael _______ be a policeman, for he is much too short .
A. needn’t B. can’t C. should D. may
2. I told Shally how to get here. But perhaps I _______ for her.
A. had to write it out B. must have written it out
C. should have written it out D. ought to write it out
