Hurry up, Mike. You must get to the airport an hour before the plane _____.

I think it’s_________ useful advice，so I will always remember it．

It’s necessary and important ______school teachers to teach their students how to get on well with others. —Yes, you said it.[ ]

Is his school bag _____ the floor or _____the wall?[ ]

is a good idea to bring your camera because you may want to take photos of the autumn leaves.