用所给词的适当形式填空
Ms Ba sometimes watches her students having fun ___________ (play) on the playground.
Go ___________ (cross) the bridge, you can see a tall tree with many flowers on it .
Children often enjoy ___________ (they) at school .
Sheep like to eat grass and ___________ (leaf).
Please ___________(be) quiet when you are with pandas in the zoo.
We sometimes listen to some ____________(relax) music when we’re tired.
Hunan Street is a good place ____________ (have) fun..
I like elephants because they are so ____________(beauty).
Are ___________(thief) afraid of the police? Yes, very much.
Do you think koalas are very ___________(friend) to people?