用方框中所给短语的适当形式填空。

have (got) to   had better  would rather  cannot help but   be supposed to   used to  be about to   be able to

He       escape from the burning house with the help of the firefighters.
You         take a raincoat with you， It's going to rain this afternoon
I         jump into the river when the guide suddenly stopped me.
I         go now. After all, I promised my parents to go home early.
Jack       go to work on foot than take a bus, which is good for health.
He         be a naughty boy, but now he studies very hard.
I         laugh as the joke was so funny.
All of us          protect the environment to live in harmony with nature.