A. can B. may C. have to D. think
A. can’t B. couldn’t C. may not D. might not
A. could B. was able C. is able D. must
A. must B. could C. may D. might
A. may B. might C. must D. should
A. may B. might C. will D. should
A. will B. can C. could D. may
A. could't B. shouldn't C. mustn't D. may not
A. Would B. Can C. Will D. May