Choose the correct answer.

1. Who is responsible __________ dealing with complaints?

2. We began __________ looking round for advertising agencies which had experience of our market.

3. The covering letter wasn't attached __________ the CV.

4. Don't you think you should apply for the job __________ writing?

5. I was only absent __________ the office for a few minutes!

6. Success in this industry depends a lot __________. luck!