31.Children above 12 are able to take part in skiing or other activities____for them.
More than twenty years____________since he came to teach in this school, and every student and every parent_____him.
________ thousands of Chinese students,Chuck has vast experience in the Chinese class.
We do not have enough money.________,we cannot afford to buy the new car.
________ the same mistake again made his parents very angry.
It was only when I reread his poems recently _______ I began to appreciate their beauty.