So far no life has been found outside the earth, but while some scientists are actively searching for living things in outer space, others firmly believe there ____ .

A. mustn’t be                      B. may not be

C. can’t be                        D. won’t be

 Such great achievements ____ so far that many friends abroad can hardly believe that.

A. has China made                   B. China has made  

C. does China make              D. are made in China

 As is known to us all, the opening ceremony of the Shanghai World Expo, ____ theme is “Better City, Better Life”, will begin on May 1^st, 2010.

A. which            B. its          C. that         D. whose

 Our community appears more beautiful with green grass and colourful flowers ____ here and there.

A. grow         B. to grow      C. growing      D. having grown

 Wife ____ a big dinner when Husband was aware of their eighth wedding anniversary that day.

A. was still preparing              B. had hardly prepared 

C. did carefully prepare                D. would eagerly prepare

 The problem of carbon emission ____ at Copenhagen Summit has aroused the public’s wide concern.

A. discussed                        B. having been discussed   

C. being discussed                  D. to be discussed

 A major issue was put forward by some representatives at the conference ____ the teachers in the remote areas were underpaid.

A. whether      B. at which     C. where            D. that

 The customers objected ____ unfairly in the course of shopping.

A. to be treated                    B. their being treated 

C. to being treated                 D. having been treated

 — Where’s your assignment?

— ____

A. I had already handed it in.      B. It was handed in.

C. It’d been handed in.                D. It’s been handed in.

 The traffic in Shanghai will be blocked and people will come to blows _____ the government plans in advance.

A. as long as       B. unless           C. even if      D. since