I’ll never forget the days ______ we spent together.

Whose shirt is this? Is it Tom’s? — No, it isn’t. _______ is white.

If we ______ take environmental problems seriously, the earth _______ worse and worse.

What a smart and hard-working boy he is!—Right. ________ a possibility that he will win the first place in the competition.

I like flowers. I’m going to buy a housea small garden in front of it.[ ]