[ Modals ]
You __________ go through customs when you enter a new country.
A. must not
B. should not
C. must
D. don´t have to

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Gerunds as objects of prepositionVerb + InfinitiveTenses UsageFuture Continuous TenseSentence Structure and Pronoun AntecedentCompound and Complex Sentencesused to vs be used to vs get used toduring, for, whileWill and Will notPast Tense vs Present TenseOther quiz:
Grammar › ViewA: How ____ have you had a mountain bike?
B: I’ve had one ____ last Christmas.
A. ever, never
B. long, for
C. ever, since
D. long, since
Grammar › View
The thieves stole the necklace ______ it was very valuable.
A. so
B. if
C. because