You may use the room as you like         you clean it up afterwards.

    A. so far as     B. in case          C. so long as       D. even if

 It was silly of you to try to cross the desert alone. You         yourself.

    A. should have killed                      B. might have killed

    C. must kill                              D. would kill

 It was 80 years before Christopher Columbus crossed the Atlantic         Zheng He had sailed to East Africa.

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

 There are two buildings,         stands nearly a hundred feet high.

    A. the larger                             B. the larger of them

    C. the larger one that                     D. the larger of which

 The news came         our athletes had won another gold medal.

    A. which       B. whether         C. what           D. that

 We are busy preparing for the gathering            this coming Saturday.

    A. held       B. holding        C. to be held      D. being held

            with the size of the whole earth, the biggest ocean does not seem big at all.

    A. Compare    B. When comparing C. Comparing      D. When compared

 If Newton lived today, he would be surprised by what           in science and technology.

    A. had discovered                         B. had been discovered

    C. has discovered                        D. has been discovered

 This organization will provide money to those really           such as people who suffered a natural disaster.

    A. in need      B. in charge        C. in response      D. in reply

 Those who have           the accident are required to report to the police.

    A. witnessed    B. involved        C. discovered       D. recovered