Question

Поставьте где нужно must, mustnt
use must or must to fill in the gaps
1.When you leave the hiking camp you ... leave a fire.
2.When you go down a slippery road you ... be careful
3. When the weather is very hot you ... wear hats
4. When you go by boad you ... load it with to many things
5. When you are on an island you ... keepit tidy.
6. When you are in the mountains you ... throw stones

Answer 1

1) must
2) must
3) must
4) mustn't
5) mustn't
6) mustn't