呵呵``再来几个初三的英语问题哈·!

呵呵``再来几个初三的英语问题哈·!
转变下列各句的语态
1.we don't clean the classroom every day.
The classroom ___ ____ every day.
2.We keep the noise under 50dbs here.
The noise __ ___under 50dbs here.
3.Did they plant many fruit trees on the hill last spring?
Many fruit trees __ ___ on the hill last spring?
4.Someone saw him swim in Shiyan Lake yesterday.
He __ __to swim in Shiyan Lake yesterday.
5.Do many people visited our school every day
__ our school __ by many people every day?
6.The flying disk was invented by college students.
College students __the flying disk.
7.Was the special pen invented by Zhang Jie?
__Zhang Jie __ this special pen?
8.Are the cows milked by them every day
__they __the cow every day?
9.Bicycles aren't produced by them in this factory.
They __ __ bicycles in this factory.
10.Is French taught by them in this college?
__they ___French in this college?