18.-It is raining cats and dogs. 　-　　.. A.So it is　　 B.So is it　　　　her it is　her is it

17..Someone is at the door, who is 　? A.this　　　　 B.that　　　　　 C.it　　　　　 D.he

16..In the United States, bus travel doesn't cost much as train travel, 　? A.don't they 　 B.does it　　　　　 C.do they 　　　 D.doesn't it

15.　　　 　is very clear to everyone that he's round and tall like a tree. A.This　　　　 B.What　　　　　 C.That　　　　　 D.It

14.Many people now make 　　　　a rule to buy cards for their friends before Christmas. A.themselves　　 B.it　　　　　 C.that　　　　　 D.this

13.I think it a great honour 　　　to visit your country. A.to invite　　　 B.inviting　　　 C.having invited　　 D.to be invited

12.It took us over an hour 　along the street. A.walk　　　　　 B. to walk　　　 C.walking　　　　　 D.walked

11.He felt_____ to work for human rights and progress.

A.it his duty　　 B.his duty　　　 C.that is a duty D.that is his duty

10.--- Do you like _____here?

　 ---Oh, yes, the air, the weather and the way of life. Everything is so nice.

A. this　　　　　 B. there　　　　　 C. that　　　　 D. it

9. The doctor advised Vera strongly that she should take a holiday, but _______ didn’t help.

A．it 　　 　　　　　B．she　　　 　　　　 C．which　　　 　 D．he