I’m worried about my school grades. What’s your advice—You shouldn’t wait _________ the last minute to study for a test.

The students in our school go to school_____ Monday______ Friday.

The company provides cheap Internet access.________，it makes shareware freely available.

19.They talked about things and persons ___ they remembered in the school.

Why do you suggest we buy a new machine—Because the old one has been damaged ______