4．        flying is more expensive than land and sea travel，I went there by air to save time．（　　）

A．

If

B．

As

C．

Even though

D．

In case

3．As the visiting prime minister puts it，China's influence in the world will continue to strengthen______ its economy grows．（　　）

A．

although

B．

until

C．

as

D．

before

2．       most of the people believed the Bears would win，the result came as the opposite．（　　）

A．

If

B．

While

C．

Unless

D．

Since

1．Because of climate change，the ice that polar bears depend on for survival        ．（　　）

	A．	are slowly disappearing		B．	is slowly disappearing
	C．	are slowly disappeared		D．	have slowly disappeared

20．-Hello，Tom!
-Hi，jack!
-（61）F-I don't know．They all book interesting．Er，I think I'd like to go on the wildlife safari（游猎）．
-Really？
-I prefer not places，you know，like South Africa．
-Mm，I think the most exciting one is the trip to go to Greenland．
-（62）G-I mean you can really explore somewhere which isn't full of people，especially other tourists．
-Right．
-I wouldn't like to go on the safari．You can see animals in the zoo，can't you？
-（63）E-That's true．Let's have a look at one of the others．What about canoeing （划船） and rafting in the States？
-（64）D-Oh，come on．Rafting is great in Colorado．You can't complain about it．
-（65）B-Good，and you could go to Los Angeles and San Francisco．
OK，let's go there
-

A．Sounds great! B．Well，I'd like to try canoeing．                             C．Which one do you prefer，canoeing or rafting？ D．Mm，I wouldn't like to go rafting． E．Yes，bus the weather in Greenland is terrible! F．Which holiday would you like to go on？ G．Yes？

19．It was only after he came back      he decided to write to Kite to find out if he was wasting his time there．（　　）

A．

that

B．

how

C．

and which

D．

what

18．Mr．Snuth advised us to    a written agreement even it was just a small deal．（　　）

A．

hold on

B．

insist on

C．

believe in

D．

rely on

17．-I think I should wear a dress instead of this jeans．
-It's just a small informal party，so you don't have to ___________．（　　）

A．

warm up

B．

put up

C．

dress up

D．

keep up

16．He didn't____ what I said because his mind was on something else．（　　）

A．

hold on

B．

catch on

C．

take in

D．

get over

15．Tom is now in our class，but he once         in Westbrook High School for a term．（　　）

A．

has studied

B．

studied

C．

had studied

D．

studies