1. The letters are delivered by Mr Hai every day
2. The tickets are often bought at the box office by the children
3. Their homework is usually finished before bed time
4. Our execises are corrected by the teacher today
5. The shows of music on TV are often watched by us
6. A written test is done by us today
7. The Picasso's exhibition is always seen by everyone
8. The streets are cleaned by the workers everyday
9. Many accidents are caused by careless driving
10. The river bank is covered with weeds
