[ 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

Random Topics:
Much, many, a lot of, a few, a littleModal VerbsArticles & PrepositionIndefinite ArticleModal Verbs and ConditionalsContrastive ConjunctionConditional ClauseTenses, Tag Questions, Phrasal VerbsModals - Conditionals - Future TensesGrammar, Conditional Sentences, VocabularyOther quiz:
Conditional Sentences › ViewIf I finish the assignment before Saturday, I………………..(submit) it to my lecturer
A. have submitted
B. can submit
C. submitted
D. had submitted
Vocabulary › View
Liz is hoping to ___ work at a wildlife sanctuary in Kenya this summer.
A. run the risk of
B. play a part in
C. have a chance to
D. catch sight of