In China, people walk _________ the street.
He eats _______ food, so he is _______ fat.
—How are you feeling today?—________ I think I can go to the picnic with you tomorrow.
We should eat _______ fruit and vegetables, but _______ meat. It is good for our health.
—Must we keep the window _______ all the time?—No, you don’t have to.
Smoking can help you relax. But _______ it is also bad for your health.