Нужна помощь! Буду благодарна! :))

Open the brackets using the Complex Object.

1. We believe him ___ (to send) to the conference as our representative.
2. I watched them ___ (to go) down the mountain.
3. I saw her ___ (to switch) off the light and ___ (to leave) the room.
4. I heard my grandfather ___ (to tell) this story many times.
5. We saw them ___ (to approach) the forest.
6. He saw her ___ (to leave) the classroom.
7. We noticed her ___ (to turn) pale.
8. Did you hear the clock ___ (to strike) the hours?
9. We didn’t see her ___ (to come) in.
10. I heard him ___ (to speak) Japanese. It was great.