I think it's impolite _______ others waiting．（ ）
A．to keepB．keepingC．keep
Jack was a little disappointed，he still went on with his work．（ ）
A．AlthoughB．BecauseC．SinceD．If
Must I hand in the report now？
No，you ．Tomorrow is OK．（ ）
A．can'tB．needn'tC．mustn'tD．shouldn't
Peter doesn't feel sure of in his new school．（ ）
A．heB．himC．hisD．himself
The sofa is so large that it half of the room area．（ ）
A．takes upB．picks upC．turns upD．puts up
Hurry up!The movie will begin 10 minutes．（ ）
A．overB．inC．forD．at