______ good habits ______ very important.

I left my keys in the room yesterday. I had to get in_____ the window.— It’s dangerous to do that.[ ]

Most students like the teachersunderstand them well.

What do you think of the film Avatar? — It’s fantastic. The only pity is that I _______ the beginning of it.

Scientists are trying to ways to treat the terrible disease called H7N9.