—Are you free after school?

—Sorry: I’ve planned to treat a friend of mine to dinner        for his help.

A. in terms      B. in honor    C. in turn     D. in return

 All the          indicate that he has been deeply involved in the crime.

A. evidence    B. fact    C. factors     D. cause

 His speech at the meeting was really wonderful, and it could never be any         .

A. best          B. better        C. worse     D. worst

 The world is changing fast. I strongly believe that one will easily fall behind         he keeps on learning.

   A. unless        B. if           C. when       D. as

 —May I tell this to my close friend?

—No, you       . Never let anybody else know about it.

   A. needn’t      B. shouldn’t      C. mustn’t         D. can’t

 Don’t leave the water       while you brush your teeth.

   A. run      B .running     C. being run   D. to run

 It was the long March Rocket 2F, as reported,       sent Shenzhou VI spaceship into space.

   A. which     B. what    C. that      D. as

 I like      in the autumn when the weather is clear and bright.

   A. this      B. that       C. it       D. one

 Life is like a long race        we compete with others to go beyond ourselves.

A. why     B. what     C. that       D. where

 Over the past decades, sea ice        in the Arctic as a result of global warming.

A. had decreased      B. decreased     C. has been decreasing   D. is decreasing