1. A: Carl, you eat too ________ sweets. They are ________ for your teeth.
B: Thank you ________ your advice.
2. A: Chris, did you ________ Bob in Xinjiang last July?
B: Yes, I stayed ________ him when I was there.
3. A: There is ________ rain in some areas in north west China.
B: So we had ________ teach them how to save water.
4. A: My brother ________ much frozen food and fried food every day.
B: That's a bad ________. It will make him ________.