[ Grammar ]
_____ the use of cigarettes on an aircraft should have been done long ago.
A. Ban
B. bans
C. banned
D. banning

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Understanding Product Packaging and TensesVocabularyAdjective or AdverbAdjective ClauseUnscramble SentencePast Perfect or Past Perfect ContinuousTenses and ArticlePresent Perfect Simple & Present Perfect ContinuousSimple Compound and Complex SentencesSimple present/ past/ future tenseOther quiz:
Tenses › ViewI think it ______ (rain) tomorrow, so take your umbrella.
A. rains
B. rained
C. will rain
D. is raining
Verbs and Prepositions › View
Which preposition correctly completes the sentence: “They belong _ different cultures.”
A. at
B. on
C. with
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A. might
B. should
C. could
D. must
Future Tenses › View
I think I ___ a cassette recorder and use it in class.
A. buy
B. am buying
C. will buy
D. would buy