1、

请根据要求改写下列句子，每空一词。

（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．

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

____________ Lucy exercises every day？

（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 ____________．

（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．

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

____________ the music by Tan Dun sounds！