If there ______no buying and selling of animals, there ______no killing in nature.

Could you tell me ________?—Ｏf course, last night.

If you don’t have enough sleep, you will feel __________ in class.

I want to know if she ______ in my birthday party tonight.— I believe if she ______ her homework, she will join us.

Do John and Betty have a child？ —Yes. They _______ for twenty years.