1)Mike __ be home by now.His plane landed four hours ago. a.must b. can't c.can d. mustn't 2)Henry __ come over today.He may finish work late. a.couldn't b.didn't need to c.might not d. can't 3) I __ come to the concert tonight,but i'll give you a call later and tell you for sure. a.may b.can c.must d.could 4) Ann __ be in her office right now. All the lights are off. a.mustn't b.can't c.needn't d.doesn't have to
1) a. must
2) c. might not
3) a. may
4) b. can't