The conservation area is very important for preserving many animals and plants, which would ______ run the risk of becoming extinct.

   A. otherwise            B. therefore                  C. though                            D. instead

 ______ we think of Ben, we have to admit that he is a highly competent man.

   A. However             B. Whether                   C. Whichever                D. Whatever

 Lin Tao has returned from the UK recently. He ______ at Cambridge for four years, during which we ______ with each other on the Internet.

   A. has studied; has communicated                B. had studied; communicated

   C. studied; had communicated                      D. studied; communicated

 Generally my father is a mild man, but when he gets angry, he ______ be fierce.

   A. can                     B. should                      C. must                        D. shall

 All our efforts will be made to create _______ more peaceful and more advanced world, ______ place where everyone enjoys his life and freedom.

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

 Shortly after suffering from a massive earthquake and        to ruins, the city took on a new look.

  A. reducing               B. reduced                    C. being reduced           D. having reduced

 Team leaders must ensure that all members       their natural desire to avoid the embarrassment associated with making mistakes.

  A. get over                B. look over                  C. take over                  D. come over

 I am always delighted when I receive an e-mail from you.       the party on July 1^st, I shall be pleased to attend.

  A. On account of              B. In response to          C. In view of                D. With regard to

 There are some health problems that, when       in time, can become bigger ones later on.

A. not treated            B. not being treated        C. not to be treated        D. not having been treated

 Bears       fat stores throughout the summer and fall to have energy enough to last them through their winter sleep.

A.pack up                 B. build up                    C.bring up                    D. take up