Obligation and option

Complete sentences 1 – 17 with a suitable word from the box. More than one answer is possible in some cases.

1. A valid passport and visa are by all visitors to the country. Unless you have these, you will not be allowed in.
2. The wearing of helmets and safety clothing on site is . You may not enter the site without these.
3. Note to hire car drivers: all passengers wear seatbelts. This includes rear-seat passengers. Your insurance will be invalid if you fail to comply.
4. There are no direct flights between London and New Orleans. Passengers flying between these cities to change in New York or Washington.
5. All companies are for the health and safety of their employees while on company premises, and can face heavy financial penalties if they fail to comply.
6. Because of the recession, several companies in the area have been to close.
7. Books, clothes and food are currently from government tax, as they are considered necessities rather than luxuries.
8. safety inspections are carried out twice a year. Companies should allow government safety inspectors complete access to all areas.
9. Entrance to the museum is free, but visitors are asked to make a donation of $5.
10. There is no service charge in this restaurant, but we do ask that groups of 8 or more pay an 10% extra.
11. Unless you make prompt repayments, we will have no but to reclaim the property from you.
12. Manufacturers of packaged foods are to list all the ingredients clearly on the box or package. This should include any artificial colorings and additives.
13. You are under no to work overtime, but we hope that you would be prepared to work late at least once a week.
14. When Mr. Smith made a mistake that cost his company over $100,000, he felt to leave and look for work elsewhere.
15. The project is very exciting, but everyone realizes that it will a lot of work.
16. You can order our latest software programs by phone or online. And the great thing is, there's no to pay until you've received your purchases.
17. It is absolutely that deliveries are made on time, otherwise we will start to lose customers.