用关系代词或关系副词填空

It is known ________ smoking is harmful to one's health.

用关系代词或关系副词填空

________ is known , smoking is harmful to one's health.

用关系代词或关系副词填空

He asked a lot of questions, most of ________ had nothing to do with his lessons.

用关系代词或关系副词填空

I still remember the day ________ I fist came to Beijing.

用关系代词或关系副词填空

This is the house ________ roof is leaking.

用关系代词或关系副词填空

Is there any reason ________ you were late for meeting?

用关系代词或关系副词填空

I have never heard such stories ________ he tells.

用所给的词填空(that, who, what, where, whether, whose, how)

I'm sure ________ the problem can be solved.

用所给的词填空(that, who, what, where, whether, whose, how)

________ we'll hold a meeting or not has not been decided.

介词填空

He beat the dog off ________ a stone.