Must I learn all these words by heart? —No, you ______. It’ll be fine if you copy them in your exercise books.

Look, what’s _____ the tree?—A bird. It is _____there.

Sally is very happy. There is a big smile ______ her face. [ ]

How often do I need to feed the dog?——It___food everyday, or it will be hungry.

We are sure one day the air in Beijing will be much ______ than today.