Johnny, you ________ play with the knife, you ________ hurt yourself.

In the old days, most teenagers had to work for the landlord (地主) in the field to help _____ their families, because their families couldn’t _____ education for them.—What a pity!

It is often said that the joy of travelling is______in arriving at your destination _____in the journey itself

How are you—-______________

下列句子中，标点符号使用正确的一句是