SectionA 4a部分答案
1、is important to
2、are supposed to/are expected to
3、is important to
4、are supposed to/are expected to
5、are expected to/are supposed to
SectionA 4b部分答案
<l>isn't/is not expected to know
<2>to Iearn
<3>to understand
<4>are supposed to do
<5>aren't/are not supposed to do