1. The teacher corrects our exercises at home.

$\longrightarrow$ Our exercises at home are corrected by the teacher

2. Alice gave me a wonderful present.

$\longrightarrow$ A wonderful present was gave me by Alice

3. They are building several new schools in our town.

$\longrightarrow$ Several new schools are being built in our town

4. We have made great progress in industry, science and medicine.

$\longrightarrow$ Great progress in industry, science and medicine have been made

5. Sam killed a lion last week.

$\longrightarrow$ A lion was killed by Sam last week

6. Peter broke this bottle.

$\longrightarrow$ This bottle was broken by Peter

7. They are learning English in the room.

$\longrightarrow$ English is being learnt in the room

8. They can't make tea with cold water.

$\longrightarrow$ Tea with cold water can't be made

9. Somebody has taken some of my books away.

$\longrightarrow$ Some of my books have been taken away by somebody