Can you explain ______the sun goes down in the west.

A. why is ti that      B. why it is that   C. how it is that  D. how is it that

 I would appreciate it ____ you call back this afternoon for the doctor’s appointment.

 A. until     B. if    C. when     D. that 

We are in great need of your help. Your advice will certainly make a _____.

 A. point        B. sense        C. meaning   D. difference

 ___ How about a picnic this week?

  ____ Sounds fine. But can you be more ___ ? With whom and where?

 A. special       B. Specific     C. realistic    D. practical

 _______ everyone here , I wish you a pleasant journey back to your country.

 A. By means of   B. On behalf of  C. In search of  D. For fear of

 It’s already 10 o’clock . I wonder how it ____ that she was two hours late on such a short trip.

 A. came to     B. came out   C. came about   D. came up

 Some adolescents are ______ to taking drugs , which worries their parents a lot

 A. abstract     B. addicted   C. devoted      D. abnormal

 Not until I received her e-mail____ that  she had been abroad.

 A. did I know   B. I knew   C. have I known     D. I have known

 It’s _____my father used to work ____ I am working now.

 A. where; that   B. where ; when  C. that; where  D. that; that

 I got to the office earlier that day , _________ the 7:30 train form Paddington .

 A. caught     B. to have caught     C. to catch     D. having caught