Ex 3

1. was thrown

2. been fixed

3. is being done

4. has been found

5. be finished

6. be helped

7. be made

8. was cleaned

9. will be washed

10. is being used

Ex 4

1a. It was sent to the wrong address.

  b. We will send it back.

2a. Maria taught her son the way to use the crosswalk for the first time.

  b. She was taught by her parents when she was six.

3a. The pickpocket was almost disappeared into the crowd.

  b. He was caught by an alert police officer.

4a. Tony cut down a dead tree.

  b. The tree fell to the ground with a crash.

  c. Fortunately, no one was hurt.

5a. Something very fast was happened yesterday.

  b. A deer was hit by a truck.

  c. It was killed instantly.

  d. It died instantly.

Học tốt nha ! :>