How many types of memory are there _____ our brain?[ ]

Simon, when are we going to have a class meeting this week?— Sorry. Ask our monitor, please. He know.

What’s the weather like there?—It is terrible. It’s raining so _________ that we can ___________ go out.

Zhang Lili, _________ good teacher, is regarded as _________ most beautiful teacher at present.

It is very important for us to _______ between good and bad.