Sichuan is __________ China.
—I didn’t see you at the beginning of the party last night.—I________on nay biology report at that time.
The girl was flying a kite________her father came back.
—I went to see you yesterday evening.But you weren’t in.Where were you then?—I’m sorry.I________a walk by the lake with my classmates.
While we________about Mr.Wang in the classroom,he came in.
I was doing my homework________my father was reading newspapers.A.howB.whileC.if