[ Modals ]
You ______stop when the traffic lights turn red
A. must
B. have to
C. can

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Grammar & Vocabulary › View____ to the language center when I saw you yesterday morning?
A. Had you gone
B. Did you go
C. Were you going
D. Have you gone
Grammar › View
The mountain is steep and wide with lots of trees. Is the word mountain a concrete or abstract noun?
A. concrete
B. abstract
Gerund vs. Infinitive › ViewMoving is always troublesome.
A. Verb
B. Participle
C. Gerund
Grammar › View
I hope _______________ the exam at the end of the course.
A. passing
B. pass
C. to passing
D. to pass
