Tom got nothing in______ for her kindness,_____ made him very sad.
scientists have learned a lot about the universe, there is much we still don't know.
If you come to visit China, you willa culture of amazing depth and variety.
— Can you come to a party on Saturday, Peter?— Oh, ______I'm already going out, I'm afraid.
―I’ve got something weighing on my mind. Could you give me some advice?―______. Tell me all about it and I’ll do what I can.
Being constantly exposed to advertisements is annoying, but it ______ be pleasant sometimes.