Choose the right word for each gap.

1. Why is a ... tap so annoying?

2. Just ... your foot when you're ready to talk.
3. A very naughty child can ... a parent to distraction .

4. Kennedy's death will always ... a mystery.

5. He drives me ... with his constant criticizing.

6. She ... her mother very much.

7. It is a ... enigma to foreigners.