Being a good listener is a kind of quality and that’s ________ it takes to keep friendship.

A. how                        B. what                        C. which                             D. where

Scientists say it may be five or six years ____ it is possible to test this medicine on human patients．

A. after                  B. since               C. before                     D. when

The Amazon Valley is very important to the natural balance of the earth. Forty percent of the world’s oxygen ______ there.

A. produces             B. is produced          C. has produced               D. has been produced

Once you turn off the television, you’ll be surprised how much extra time you’ll have        your life.

A. explore              B. to explore              C. exploring                   D. explored

These changes will cost quite a lot , ______ they will save us money in the long run.

A. so                          B. but                               C. or                                D. for

Happiness is an active state of mind ______ one thinks one’s life meaningful, satisfactory and comfortable.

A. where             B. which             C. there                      D. when

--- Did you attend Tom’s birthday party at the Grand Hotel?

--- I wish I ______. I _____ an English lecture in the school hall.

A. have; gave            B. did; have given        C. do; had given          D. had; was giving

Beijing National Stadium，the showpiece of the Beijing Olympics，has fallen into disuse since the end of the games，_________it difficult to make a profit

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

---The weather is changeable here. Please take more clothes.

---      .

A．It’s a pleasure          B．Well, it just depends      C．Take your time                    D．OK, just in case

The New York Times started ____ new text messaging service that delivers ___ latest news to mobile phones

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