—Could you please help me sweep the floor?—________.
When H7N9 bird flu first appeared, people didn't know_______ doctors could cure it.
---Hurry up, _____you will miss the school bus. ---I know that, Mum. I’ll be ready in a minute.
Some people prefer yellow when they hope for__________.
The boy looks nice____white and the red sweater looks good _____the girl.
— I didnt’ t expect to see you studying at the library so early in the morning.—, huh?