I was listening to the music ________ there was a knock at the door.
A. while
B. when
C. because
D. until
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You may leave the classroom when you ________ writing.
A. will finish
B. are finishing
C. have finished
D. had finished
I don’t know if he ________ tomorrow, if he _________ ,I’ll meet him.
A. will come, comes
B. comes, comes
C. will come, will come
D. come, will come
Would you give Johnny this letter if you ________ to see him this week.
A. will happen
B. happen
C. are happened
D. happened
Mary lives in the room, the door _____ opens east.
A. of it
B. of which
C. of that
D. whose