(Combine each pair of sentences, using the adjective + to inf./ noun clause)
1. We are very worried that the air in the city is becoming heavily polluted.
2. My little sister was happy to collect a lot of empty beer cans for her mini-project.
3. We are ready to clean the environment.
4. The boys are excited to play in the coming game.
(Change into passive)
1. Our classrooms are cleaned by us every day.
2. Many new houses will be built in that area by the workers next year.
3. A lot of rice is grown in Asia.
4. Rubbish mustn't be thrown carelessly in the public places.