[ Expressing Obligation and Modals ]
“This class is very dirty. We… clean it before the teacher comes.” The best answer to complete the sentence is…
A. should
B. must
C. must not
D. should not
Select your answer:
Random Topics:
Verb Tenses and Past ParticiplesTOEFLRegular and Irregular AdverbComparative and Superlative AdverbsPresent simple & ContinuousPresent Perfect Simple & ContinuousSynonymsModals for Necessity and SuggestionsDeterminersOther quiz:
Tenses › ViewIt is a clear fact that we ___ most of the precious natural resources by the time we ___ to do something to protect them.
A. have lost / will decide
B. will have lost / decide
C. had lost / have decided
D. are losing / decided
Mixed Tenses › View
Jing Wei _______ for Sharon for over an hour, but she still has not arrived.
A. has been waiting
B. is waiting
C. had been waiting
D. have been waiting