1、The car is Mr.Black's ( He) is our good friend.
2、Is the clock right Yes,( it) is.
3、Jack's parents are from Australia .I know ( it--指代这个事实；them---指代他父母) before.
4、Let's take a walk .It will make (us ) feel better.
5、Mike is studying English .( he) wants to be an English teacher.
6、Do ( you) like watching cartoons?Yes,I do.
7、Who is that girl (She ) is Tom's sister.