Use must or mustn't to fill the gaps.

Решение:

Это задание на использование модальных глаголов 'must' (должен, обязан) и 'mustn't' (не должен, запрещено). Нужно выбрать правильный вариант в зависимости от смысла предложения.

• 1. Use must or mustn't to fill the gaps. must you a good traveller?
• 2. When you go hiking through a forest you mustn't drop litter.
• 3. When you leave the hiking camp you mustn't leave a fire.
• 4. When the weather is very hot you must wear hats.
• 5. When you go down a slippery road you must be careful.
• 6. When you go through a tunnel you must roller-skate.
• 7. When you go by boat you mustn't load it with too many things.
• 8. When you are in the mountains you mustn't throw stones.
• 9. When you are on an island you must keep it tidy.
• 10. When you go on board a big ship you must show your documents.

Ответ:

1. must
2. mustn't
3. mustn't
4. must
5. must
6. must
7. mustn't
8. mustn't
9. must
10. must