Can you tell me how many study groups there are in a class?— Generally speaking, a class often ___ 8 study groups, each with 7 group members.

, how are you getting on with your composition— I have rewritten it so many times that I wonder if I________ it.

mber _______, but I have forgottenthe exact number

下列各句中，加点的成语使用恰当的一项是（ ）（3分）

I hope that you ______a good time thisevening.