Choose the correct preposition.
1. Gillian left home early so that she wasn't late for/at the meeting.
2. The manager was very satisfied with/for her staff's efforts during the sale.
3. The surgeon had to operate in/on the patient immediately.
4. Linda's work experience made her the most suitable candidate to/for the job.
5. All of the staff are hard at/to work in the chosolate factory.