Question 21: You ………. eat in the class. A. should B. shouldn't C. mustn't D. must Question 22: You ……….. ask your teacher if you don't understand the lesson. A. don't have to B. mustn't C. should D. ought Question 23: A computer ……….. think for itself; it must be told what to do. A. can B. must C. can’t D. will Question 24: Johnny, you ………… play with the knife, you ………… hurt yourself. A. shouldn’t/must B. can’t/ shouldn’t C. won’t / can’t D. mustn’t/ may Question 25: I ……….. go home too late. My parents are very strict. A. mustn't B. ought C. don't have to D. should Question 26: You ………. pick up Tom at the airport because Judy will pick him up. A. ought not to B. mustn't C. shouldn’t D. don't have to Question 27: Since we have to be there by 8.30, we ……….. take a taxi. A. had better B. ought C. are able to D. may Question 28: It's cold. You ………. turn on the fan. A. should B. have to C. must D. shouldn't Question 29: You ………. drink a lot of water every day. A. ought not to B. must C. ought to D. have to Question 30: You'd better ……….. late next time. A. don't B. won't be C. not be D. not being Giải nhanh dum mình với ạ