句子转换：
问题描述：
句子转换：
Making snowmen with friends is very interesting
（）（）very interesting（）（）snowmen with friends.
2.I dream of studying aboroad.
（）（）（）（）)aboroad.
3.It takes them three days toprepare for the test.
They（）three days（）for the test.
答
it is to make
i dream to
spend preparing