---Walking is _____legs and hearts. ---Yes, we should often walk.A. bad for B. good for C. good at
Nobody taught _____ Chinese. He learned all by ______. What a clever boy!
-What do you think of the dish? -It looks _____ and it tastes _____ too.
If you want to be healthier, you shouldn't do _____ in the classroom all the time but do more _____ on the playground.
They looked _____ each other and kept their secrets _____ themselves.
Jack had a wonderful time _____ many interesting places in Beijing and he had much time __________ the city.