Помогите с предложениями, пожалуйста.

Complete the sentences with the active or passive past simple form of the verbs in brackets.

1. Fireworks ... in China (invent).
2. The Parthenon ... by the Greeks (build).
3. Oliver Stone ... JFK (direct).
4. Salt ... to preserve food before fridges .... (use, invent).
5. Tchaikovsky ... Swan Lake (compose).

1 were invented

2 was built

3 was directed

4 was preserved,were invented

5 composed