21．—Do you mean you won't sign up for the summer course?

—________ I just don't have enough money for it at the moment.

A．It depends.　　　　　　　　　B．It's up to you.

C．Not really.　　 D．What's your idea?

22．I stood there facing the beauty of nature and felt ________ sort of excited—all feelings floated in ________ mind.

A．a; the　　　　B．the; the　　　C．不填；不填　　　D．不填； the

23．—Hello, Joe, where are you now?

—Hello, I'm on the bus. I ________ be home in about fifteen minutes.

A．ought　　 B．need　　 C．would　　 D．should

24．Patiently the crazy fans of space exploration ________ for two hours, and they will wait till China's space heroes arrive.

A．were waiting B．waited

C．had waited D．have been waiting

25．Recently I bought an MP5, ________ was very reasonable.

A．which price B．the price of which

C．its price D．the price of that

26．Young professionals and recent graduates have struggled to find work in a sliding economy, ________ one area—Silicon Valley—has been relatively unaffected.

A．so B．but C．and D．for

27．China plans to spend more than 150 billion yuan in the northern Shanxi province, which ________ one?third of China's coal output, by 2015.

A．accounts for B．answers for C．provides for D．calls for

28．A robot dog is said to have been developed, which can do whatever its master ________.

A．tells it　　 B．tells it to　　 C．tells to do　　 D．tells it to do

29．I told him to remember not to make ________ that he knows well he may not achieve.

A．promises B．purposes C．choices D．changes

30．The online community is so large that users can hide their real identities, ________ it hard to trace behavior to a real person.

A．making B．to make C．made D．being made

31．He told the story by describing how US?China trade ________ both countries since the establishment of formal relations.

A．benefited　 B．have benefited C．had benefited D．was benefited

32．—Dear Carl, ah，...well, do you mind lending me your new car?

—No, ________ you don't drink before driving.

A．as soon as B．as far as C．as long as D．as much as

33．—John, where are the cookies? Don't tell me you ate them all!

—Yes, I did. I couldn't ________ it. They were so good.

A．get　 B．find C．help D．make

34．China had 3.68 million km of roads by the end of last year, more than three times ________ it had in 1978.

A．that B．what C．one D．those

35．Now students pay much attention to abilities, ________ like before when they only noticed language points and grammar.

A．more than　　 B．other than　　 C．rather than　　 D．less than