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4. Why shouldn’t you listen to music while climbing?
Because you can hear what is going on around you.
3. Why mustn’t you climb without a rope?
Because it is dangerous for you.
2. Why must you wear comfortable clothes?
Because comfortable clothes can make you less tired.
1. Why must you climb with someone?
Because you can ask for help if you meet some problems.
People are very (1) _______ about the conditions of the ancient forests of Canada and want to save them. Many visitors to the forests use knives to cut their names into the trees, some of which are hundreds of years old. (2) ________ there are litter bins, people still throw rubbish into the (3) ________ and this causes plants and fish to die.
People from local villages have helped clean up the forests. We hope (4) _______ will play their part in (5) ________ Canada’s forests clean too!
4.Complete the passage with the correct form of the words in the box.
worried
Although
stream(s)
tourists
keeping
although keep stream tourist worry
You should _______________________.
You shouldn’t __________________________.
You must _____________________.
You mustn’t __________________________.
help clean up the forest
throw rubbish into the streams
take your rubbish home
cut your names into the trees
visitors to the forests
a student
What can we do to protect our world?
5.Read and think.
give reasons