—Unluckily, you couldn’t come to the picnic with us. It was so much fun there. You must come next time.—No, thanks. I don’t think I ______ any fun.
I’ve ____ met her before, so I don’t know her.
--- ____ have you been a member of Greener China? --- For two years.
--- Have you ____ your key? --- No, I’ve ____ for it everywhere, but I can’t find it.
My brother always ____ his lesson, so he is a top student.
The dog is very ___, and it can work out the problem____.