I. Choose the active or passive form of the verb in brackets for each sentence.
1. Deforestation (should stop / should be stopped ) right away.
2. Thousands of trees (cut / are cut) down every day.
3. People ( are destroying/ are being destroyed) forests without thinking for the future generation.
4. This river (polluted / were polluted) by the factories located on its banks.
5. Scientists ( have searched / have been searched ) for alternative sources of energy for a long time.
6. Natural resources (will use/will be used) up in the next few decades.
7. We ( were taking/ were being taken) to the zoo by our teacher that day.
8. A cobra ( can kill/ can be killed) an adult with just its one bite.
9. Ecotourists ( usually present / are usually presented ) with the diversity of animals in the forest.
10. In my country, elephants ( have protected/ have been protected) very seriously.
Loga
Sinh Học lớp 12
