Tommy， don’t make a noise！ If you have any questions， please your hands.—Sorry， Mr. Smith. I won’t do it again.

st, I didn’t know what______ Facebook was, andnow I do know what it is. I have to say, it sounds like ____huge waste of time.

No matter how much time I spend planning a class, little things still _____ go wrong So I had no perfect class and I reflected all the time

Our class _______ 55 students at that time.

While the police have already done a lot of investigation, much evidence _____