Complete the sentences with the words below.

Write one word in each gap.

on, hope, hopes, for

In the [ ] of finding convincing evidence, he returned to the crime scene.

I don't want you to get your [ ] up, but you will have a job interview with my boss tomorrow.

Amelia is the most optimistic person I've ever known. She always hopes [ ] the best.

You shouldn't pin your hopes [ ] that politician. He promises a lot, but in the end he will not do anything.