Little boy, don’t play with the knife,__________ you’ll cut your hand.–Sorry, I won’t.

not be a great suggestion But before _______is put forward, we’ll make do with it

Mr. Green speaks very loudly ______all people can hear him clearly.

The science of medicine,progress has been very rapid lately, is perhaps the most important of all the sciences.

She is a ________girl，and she does everything________．