-----This returned Chinese scholar has become one of the top experts in this field.

-----Yes, I know him very well. He _____ in Africa with wild animals for eight years.

   A. is working      B. had worked      C. worked      D. has been working

 After I had finished eating, he advise me ______ immediately.

   A. set off   B. set aside  C. set down   D. set about

 Missing the flight means _______ for another three hours.

   A. waiting         B. to wait           C. wait            D. to be waiting

 We arranged to meet at 8:00, but she never ______.

   A. turned down          B. turned off             C. turned over              D. turned up

 When we were young, every evening my brother and I____ stay at home waiting for our mother.

   A. would       B. might       C. should       D. could

 What he said just now_______me of that American professor.

A.mentioned    B.informed    C.reminded     D.memorized

 We couldn’t trust her for she is always____. Look, she___ some eggs on the table and said these newly- ____ eggs were her own. In fact they were her neighbor’s.

A. lying; lay; laid   B. laying; lied; lain    C. lying; laid; laid  D. laying; lay; lain

 We don’t doubt _____ he will succeed in the research work.

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

 — Anything new in the new regulations（规则）?      — They will ______ to us all.

A. great benefit      B. do harms      C. do good          D. for the benefit

 I ______ her, but I never could.

    A. ought to help      B. must help      C. must have helped          D. ought to have helped