[ Modal Verbs ]
You ______ turn right when the light is red.
A. don’t have to
B. must
C. mustn’t
D. have to

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Grammar › ViewOn the sun deck, there— several chairs and a table.
A. was
B. were
C. is
D. all of the above
Tenses › View
How long ___ he been staying in Siem Reap before he moved to Phnom Penh?
A. has
B. had
C. is
D. was
Vocabulary › Viewimmediately noticeable, usually in a positive way
A. striking
B. investor
C. infinite
D. humble
Grammar › View
She __________ writing a letter now.
A. are
B. is
C. were
D. was
