动词填空 用括号内所给动词的适当形式填空，并将答案写在答卷标有题号的横线上。（本大题共8分，每小题1分）
If you ________(visit) gardens in Suzhou, you can go hiking in Lushan Mountain.
Jack, one of my buddies, kept ____ (nod) his head as if he completely understood what I said.
When his father came from work, his mother__________(iron) his shirts already.
---Must the letter ____________(write) before class is over?
---Yes. The earlier, the better.
If you ________(not be) careful, you may hurt yourself.
---Can you see what __________(happen) over there?
---No, let’s go and have a look.
It seemed hopeless _________(get) inside because the line was so long.
He told me that he_________(not attend) the conference until he was invited.