I don’t think _____ possible to master a foreign language without much memory work.

　 A. this 　 B. that    C. its 　 D. it

If no one _____ the phone at home, ring me at work.

　 A. returns 　 B. replies C. answers 　 D. receives

  If no one _____ the phone at home, ring me at work

　 A. returns 　 B. replies  C. answers 　 D. receives

They will complete the work ______.

　 A. after a few weeks’ time 　 B. in a few weeks’ time

　 C. after a few weeks’ time 　 D. in a few week’s time

 Is this the reason ____ at the meeting for his carelessness in his work ?　

A. he explained                     B. what he explained　

C how he explained                D. why he explained