1 . In many habitats of the monarch butterflies, people are________ the natural environment, such as cutting down trees and using chemicals. (根据句意填空)

2 . He is __________from tension and doesn’t know how to deal with it.(用适当的词填空)

3 . We ____________a survey to find out what our customers think of their local bus service. (根据句意填空)

5 . If you look out of the window on the left of the bus, you’ll see that we’re now ________ the Tower of London.（根据句意填空）

6 . He is ________ on his work now. Please don’t disturb him. （根据句意填空）

7 . Large quantities of waste water are ________ into the river, causing more and more serious environmental problems. (用适当的词填空)

8 . Meanwhile，they should encourage those among us who cannot swim five yards before they are________ for air.

9 . Most people there do not realize that they are _____ polluted air.