Actually it was not until 4 June ______ the two foreign teachers arrived at our school.

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

So many uses have been discovered for this wood ____ the supply of white pine is becoming smaller and smaller.

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

 Experts have been warning    of the health risks caused by passive smoking

   A. at a time     B. at one time    C. for some time   D. for the time

---- Though Liu Xiang was unable to compete in the Beijing Olympics, he is still our hero.

---- ____. Nobody will love him any less.

A. I don’t agree with you     B. I can’t agree more

C. I can’t agree any less      D. I don’t agree more