(      )21． Mr Green _________to the manager now． You d better call him later．

(    )50．I prefer not to eat too much food ________is fried，like French fries．

(    )49． It's time to say goodbye to my school． I'll always remember the people ________have helped me．

(    )48． Sorry，we don-t have the coat_________ you need．

(       )47．—I really hope to keep in touch with Lily．

             —Sorry．l don-t know _________ ．

(    )46．There are so many kinds of MP5 in the shop． We can-t decide _________ ．

(     )45．1 really want to know_________

(      )44．—Did you call Sara back?

            —I didn’t need to，_________we’ll have a meeting together tonight．

(    )43． _________ scientists have done a lot of research on A (HINl) flu，there are still some cases for further study．

(      )41． —1 hear _________ your grandpa _________ your grandma like watching Min Opera．

                  —Right，just as many old people do in Fuzhou．            

(      )42． —Will you go camping with us this weekend?

             —Good idea，if it _________．