1.What kinds of homes will we live in the future.Nobody ( ) be sure,but scientists are working out

题目

1.What kinds of homes will we live in the future.Nobody ( ) be sure,but scientists are working out
new ideas now.A,Will B,May C.Can D.must 2.I ( ) like to know where you were.A.Shall B.Should C.Do D.May 3.( ) you be happy!A.Might B.Must C.Wish D.May 4.The matter ( ) be changed into gas ,but it ( ) be heated to its boiling point.A.May;Needn't B.May;Can C.Mustn't;Needn't D.Can;Must 我对这些题目有点疑问,请多多指教..
第四题第一空为什么不能用can?

答案

这些问题考查的都是情态动词的用法
第一题：
选择C项
What kinds of homes will we live in the future.
Nobody can be sure,but scientists are working out new ideas now.
此处可以根据句意理解
没有人能够确定未来人们究竟会住怎样的房子?
其他的几个句意明显不通
第二题：
选择C项
I do like to know where you were.
此处如果要考察情态动词的话
应该是这样的：
I would like to know where you were.
此处的do是强调的意味
第三题：
选择D项
May you be happy!
表达愿望、祝愿时,一般这样表达：
May you both be happy!
May they live long!
Long may he live!
May she enjoy her life!
第四题：
选择A项
The matter may be changed into gas ,but it needn't be heated to its boiling point.
译为：这个物质能变成气体,但是不需要加热到沸点.
第四句用can也是可以的
语法上,意思上都说得通
但是选项的组合只能是A项