Have you read the poems ______ by Du Fu —Of course, many of them.

I can’t find a proper dictionary _______ I can turn in my study

The reason why you are panicking is _____ you haven’t prepared well for what’s going to happen.

Every pupil has his own potentialso it is not proper to _____them ____two kinds．

passed this afternoon, I saw a little boy waslying on the grass, his hands _____ under his head