Task 1: Put these sentences into the active voice: Đổi sang câu chủ động 1. These artificial flowers are made of silk. 2. The lesson are being written by the students now. 3. These exercises were done well. 4. What was being done to help the poor in the city? 5. No mistakes have been made in his composition. 6. This dress must be washed in cold water. 7. This job has to be done at once. 8. These animals at the zoo are fed twice a day.