用括号中所给词的适当形式填空
1.—Look!What's the boy doing in the river?
—He __________(swim).
2.—Are the girls playing games?
—No,they __________.They ____________(clean)the desks chairs.
3.The students _____________(play)football and their teacher _____________(watch） them.
4.—Jim,___________ you___________ your homework?(do)
—Yes,I am.
5.The old woman ___________(carry) water.Let's _________ and _____________ her.(go,help)