______ the blackboard, and you can ________ some number on it.

Could you tell us ______ happens when one student in class expresses a personal opinion _______ maybe upsets other students?

What time ___________ we ___________ tomorrow? —At six in the morning．

Is your friend looking forward to going on vacation this summer ?—Yes, she’s _______the days .

I want to buy a hat, but there are so many kinds that I can’t decide to take.