Are you a good traveller? Use must or mustn't to fill the gaps.

Решение:

Задание заключается во вставке слов must (должен, обязан) или mustn't (не должен, нельзя) в предложения, чтобы они имели смысл в контексте путешествия.

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

Ответ: 1. must, 2. mustn't, 3. must, 4. must, 5. mustn't, 6. mustn't, 7. mustn't, 8. must, 9. must.