Complete the sentences with the correct forms of the verbs in brackets.

Write one word in each gap.

I heard my friend [ ] (to sing) in the bathroom. It was really funny!

I saw children [ ] (to throw) a big stone into the sea. They did it and ran away.

I felt the ground [ ] (to shake) for nearly a minute. It was rather scary!

The detective saw a gangster [ ] (to shoot) a poor girl. The girl fell on the ground.

We noticed George [ ] (to steal) the class register. Luckily, we managed to stop him.