No student ______ go out of school for snacks during the break without the teacher’s permission.
. Our TV sets sell well, but ten years ago no one could have imagined such a big share in the market that they ____.
. In salad bars the waiter does not bring you salad. You have to____ yourself, usually to as much as you want.
. ---How do you like the film? ---There was nothing special--- it was only ____.
.--- What are you going to do next? --- To write a science story about outer space ___ by Science and Technology Press.
. I'll be home late, but please don't stay ____ for me.