[ Passive Voice and Modals ]
They _________________________ complete their parts of the assignment, or we will fail.
A. have
B. has to
C. must to
D. must

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Articles › View. . . Great Wall of China is a must-see attraction.
A. a
B. an
C. the
D. –
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I got three letters. One was from my father. Another one was from my sister. … letter was from my girlfriend.
A. the other
B. another
C. others
Verb Tenses › ViewHe had ? (to make) a lot of progress before he got stuck.
A. made
B. makeed
C. maden
D. maked
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I’d been eating vegetarian meals………….. when I gave up.
A. three times
B. for three years
