1. (2016·南通) 请根据要求改写下列句子，每空一词。

1. （1） We held a welcome party for the exchange students yesterday．（改为否定句）

   We   a welcome party for the exchange students yesterday．

3. （2） Lucy exercises every day to keep fit ． （对划线部分提问）

     Lucy exercises every day？

5. （3） He can't finish the task in time if nobody helps him．（保持句意基本不变）

   He can't finish the task in time  ．

7. （4） Mary is very busy．She does not have any time for social activities．（合并为一句）

   Mary is  busy  have any time for social activities．

9. （5） The music by Tan Dun sounds quite exciting．（改为感叹句）

     the music by Tan Dun sounds！