Change into plural/ Exercise

For each of the following sentences, change the subject of the verb to the plural, and change the verb so that it agrees with its subject. For example:
The room is large.
The rooms are large.

The letter was delivered yesterday.
The letters were delivered yesterday.

The tourist has a map.
The tourists have a map.

The studies hard.
The s study hard.

1. The book was heavy.
2. The train has left.
3. The bird was singing.
4. The door was closed by the superintendent.
5. The shoe fits well.
6. The parcel is being opened.
7. The newspaper is read by many people.
8. The flame is flickering.
9. The ship has been sighted.
10. The street was being cleaned.