题目内容：

The children aren't at home.They______(go)to thepark
填什么
还有l两题
Air is _____(colour).We can't see it.
The new airport was in use in1998.(改为同义句)
The new airport______ ______ ______ _______ ______ 1998.
再来个分析

优质解答

have gone
colourless
was put into use since