[ Modal Verbs ]
They ___ be on vacation. I saw their house was locked up.
A. can
B. must
C. may
D. might

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Take or PutQuantifiers & Modals of ObligationTOEFLOpinion / AgreementPassive Voice - Present Simple and Past SimpleRelative PronounsPast Progressive TenseGrammar - either...or, neither...norPronouns and QuantifiersFuture Simple TenseOther quiz:
Homophone & Homonym › View He used a chain saw to cut down a tree.
A. toothed cutting tool
B. past tense of see
Grammar › View
A:Hey, I got a good grade on the science test. B:That’s great. A:I think(覺得)I could do well(好地)on the test all ___ you.
A. through
B. because of
C. because
D. by
Grammar › ViewAl Samha is located …….. Abu Dhabi and Dubai.
A. next
B. along
C. to
D. between
Articles › View
There is a huge gap between …………… rich and…………… poor in this country.
A. a-an
B. a-the
C. the-a
D. the-the
