[ Grammar ]
They ___________ (play) football when it started raining heavily.
A. were playing
B. plays
C. played
D. playing

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Phrasal Verb › ViewZhi Ning ___singing even after the music had stopped.
A. keep on
B. keep in
C. keep up
D. keep out
Modals › View
Students must / must not bring their laptop to every class except for music classes.
A. must
B. must not