—This wall of air is an effective answer to the problem  and it ____ work.  —But it is a question to put such a wall of air around the statue. 

—I don’t suppose they could have finished their experiment,      they?—       , they are still doing it in the lab.

 "You  ____be so tired that you had to stop to rest．"

Wen Jiabao told the orphans in Wenchuan  Earthquake not to cry.His words ____not  have calmed them instantly,but his concern  about common people was obviously seen.

It’s John’s birthday today. I wish I _____ her out to a superb restaurant for dinner, but I’m too busy recently.