用括号中所给单词的正确形式填空。

1. Father's Day is on the _____ (three) Sunday of June.

2. The population in China is much _____ (large) than that in Australia.

3. I haven't seen my grandma for a long time. I' m looking forward to _____ (visit) her soon.

4. Peter and Simon enjoyed _____ (they) at the English party last night.

5. We were discussing the details of the charity show when the teacher _____ (come) into the classroom.

6. Tom never does his homework as_____ (good) as his cousin. He makes a lot of  mistakes.

7. At the exhibition, the little boy's _____ (invent) attracted many IT engineers.