What do you think of the two backpacks? —______ of them are very nice.

We are in the ____ school, but in ____ grades.

I found ___________ hard to remember all the twelve star signs because they are difficult to pronounce(发音) and spell.

Shanghai is a beautiful city. Do you think so? —Yes, I _______ there last year and fell in love with it.

This is the time during days that he has made the same mistakes.