______ the direction of the experienced experts, they successfully carried out the experiment.

   A. With          B. By           C. In           D. Under

 Some minority(少数民族) languages are losing their ______ because of the invasion(入侵) of more popular spoken ones. 

   A. ideas            B. natures          C. identities         D. characters

 If you can’t _____ a better plan, we have to carry out the present one.

   A. come along with     B. come up with       C. come across        D. come about for

 If you want to do international trade successfully, ______ of English is _______.

A. good command; a must                   B. a good command; a need 

C. a good command; a must                  D. good command; a need

 She didn’t come to his birthday party just ______what he had said to her the day before.

A. because            B. because of         C. as result of         D. thanks for

 If you want to speak good English, a large _____ is needed.

A. spelling        B. vocabulary       C. practice               D. memory

  The price rising of electricity has something to do with the part electricity______ in our life.

   A. plays　 　B. gives　 　C. takes　　D. makes

— Do you know our town?

—No, this is the first time I _____here.

A. come　 B. am coming　　 C. came　　　 D. have come

He was told that it would be at least three more months _______he could recover and return to work.　

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

 Would you please _______the paper for me and see if there are any obvious mistakes?

A. look around       B. look into      C. look up       D. look through