[ Present and Past Tenses ]
It started to snow while we … to school.
A. had walked
B. have walked
C. have been walking
D. were walking

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Grammar › ViewMy teacher last year taught me how to multiply.
A. Past
B. Present
C. Future
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My brother ……..in this factory since 1990.
A. works
B. worked
C. has worked
D. had worked
Regular vs. Irregular Verb › Viewto MEET
A. Ment
B. Meet
C. Met
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He hasn’t written a letter yet.
A. Future Simple
B. Present Perfect
C. Past Simple
D. Present Continuous