1¡¢When the man came in, gun in hand, we all stood there,__________(astonish).

2¡¢ I used to go camping a lot. So it isn’t the first time I__________(sleep) in a tent.

3¡¢I am really proud that two thirds of my hometown__________(cover) with green trees. It’s really a beautiful city.

4¡¢According to the new law, you are not supposed__________(smoke) on the bus.