Open the window please, Mike.— ________ I didn’t hear what you said.

Look ! There are so many mistakes in your composition . You ____ have paid attention to it.

Who has joined Chinese Character Dictation Competition in your class—Mei Mei and Li Li. They ______ to attend it last week.

through Li Ning,________working at a high school, ________you got to know Wangke

The new group of students is better-behaved than the other group who stayed here __________.