1.（ ）your sister ( ）her homework?用do提空 2.Let's ( )our homework now.用do提空
问题描述：
1.（ ）your sister ( ）her homework?用do提空 2.Let's ( )our homework now.用do提空
答
1.（Is ）your sister ( doing）her homework?
（Has ）your sister ( done）her homework?
（Did ）your sister ( do）her homework?
（Will）your sister ( do）her homework?
2.Let's ( do) our homework now