A. oughtn't B. can't C. didn't D. wouldn't
A. Do B. Shall C. Did D. Will
A. could not have heard B. must not hear C. need not have heard D. may not hear
A. would have received B. must have received C. could receive D. cannot have received
A. mustn't have bought B. didn't have to buy C. needn't have bought D. didn't need to buy
A. mustn't B. needn't C. may not D. can't
A. mustn't B. isn't able to C. can't D. may not
A. could be B. can have C. shall have D. might have
A. was able to B. succeeded to C. could D. might
A. would rise B. should rise C. shall rise D. used to rising