题目内容：

请根据要求改写下列句子，每空一词。

1.My brother has classes today.（改为否定句）

My brother __________________classes today.

2.Your express delivery will arrive in two days.（对划线部分提问）

__________________will my express delivery arrive?

3.Jack’s mother came back. Jack began to do his homework.（保持句意基本不变）

Jack _________begin to do his homework _________his mother came back.

4.The water was so dirty that we couldn’t drink it. （合并为一句）

The water was _________dirty _________us to drink.

5.The programme hosted by Dong Qing is very interesting.（改为感叹句）

__________________the programme hosted by Dong Qing is!