Ответ:

Rewrite these sentences in the passive form:

1. Nowadays they make ships of steel.

Nowadays ships are made of steel

2. They are painting the hull.

The hull is being painted

3. The Royal Navy has ordered two new warships.

Two new warships have been ordered by the Royal Navy

4. They had to repair the bows.

The two bows had to be repaired

5. You can join two pieces of metal together by welding.

Two pieces of metal can be joined together by welding