What great fun we had _____ in the river last Sunday!—Well, let’s go there again next weekend

The question _______ we can get enough coal for the winter has not been cleared up yet

Grandma is ill. I have to ________ her at home.

__________ it is true that a student’s most important goal is to do well in his or her studies, it doesn’t need to be the only goal

When talking about the Mid-autumn Festival,we ______ think of mooncakes and family reunion.