按要求改写下列各句，每空一词。

1．There will be less room for pigs, so meat will be more expensive．（改为同义句）

          there will not be             room for pigs, meat will be more expensive．

2．They have worked there since 1997．（对划线部分提问）

                 have they worked there?

3．The coat is very expensive．I can't buy it．（合并为简单句）

The coat is            expensive for me          buy．

4．Everyone knows that robots can do a lot for people．（变成否定句）

          knows that robots             do a lot for people．

5．”Will you visit the museum?” He said to the girl．（改为间接引语）

      He           the girl if he           visit the museum．