1. The beach is crowded ___________ holiday-makers.
2. Fruit is rich ________ vitamin C.
3. Mr and Mrs Chan are _________ holiday.
4. This is a photograph _______ Mary's family.
5. The girl is talking __________ the telephone.
6. The secretary is sending the message ______ fax.
7. The girl has received an answer _________ her letter.
8. I'm ___________ vacation.
9. Can I pay __________ credit card?
10. He's gone __________ a business trip.