1. People can use milk for making butter and cheese.
=> Milk can be used for making butter and cheese.

2. The milkman brings bottles of milk to houses.
=> Bottles of milk are brought to houses by the milkman.

3. Careless driving causes many accidents.
=> Many accidents are caused by careless driving.

4. Weeds cover the river banks.
=> The river banks is covered by weeds.

5. People speak English all over the world.
=> English is spoken all over the world.

6. They don't use the house very often.
=> The house is not used very often.

7. Do they speak French in this school?
=> Is French spoken in this school?

8. They make a lot of beautiful toys from recycled plastic
=> A lot of beautiful toys are made from recycled plastic.

9. The workers clean the streets everyday
=> The streets are cleaned by the workers everyday.