We agreed ____ here but so far she hasn’t turned up yet .
This classroom is __________ that one.
—What did you say to your sister? I saw her crying in the room.— It _________ my fault. I just said hello to her when I met her, nothing else.
—What about ____ book?—It’s too difficult ____ book for beginners.
Everyone in this country should work hard and do what they can _____ against national smog.
— Tom doesn’t seem so enthusiastic as he was two years ago. — Yes. He’s really reached a point in his career ______ he has to decide what to do next.