Doing morning exercises ______ our health.
How long _____ to finish your composition?
_____ is no difference between A and B. A.There B.Where C.It D.What
___the people have become the master of their own country___science can really serve the people.
—— Why did he let you repeat his instruction time and time again? —— ______that I remember what was_____after he went out.
Now then, children. It’s high time you ______ and dressed.