1. 根据句意选用适当的引导词填空

whether  if  when  which  who  why

1. （1） --Oh，I can't decide of the three books I should buy．

   --I think this one，Who Moved My Cheese，is the most interesting．

3. （2） --Can you tell me  the film will begin?

     --At 8：10．

5. （3）   --Do you know your friend is so unhappy?

     --Perhaps because he is missing his old school．

7. （4） --Could you tell me the man in front of the car is?

     --Sorry，I don't know，either．

9. （5）  --Will David come to the birthday party?

   --I am not interested in he'll come or not．