UNIT 7

Pollution can have serious effects on the balanced _________.

• ecosystem

• environment

• forests

• mountains

Car exhaust is the main reason for the city's _________.

• species 

• habitat

• problem

• pollution

With so many areas of woodland being cut down, a lot of wildlife is losing its natural________.

• animals

• water

• oxygen 

• habitat

The trees were a good ________ against the wind.

• provide

• nature

• ecosystem

• protection

Monarch butterflies are now a(n) _________ species due to declining numbers.

• provided

• surrounded

• endangered

• generated

The tourists cleared up the beach _________ they got back to the hotel.

• after  

• while

• before  

• if

I am going to take the exam _________ I have studied all of these lessons.

• after

• while

• until   

• as soon as

My father rides his bike to work every day to help protect the environment.

• My father rides his bike to work and to help protect the environment.

• My father rides his bike to work by helping protect the environment.

• To go to work by bike every day, my father helps protect the environment.

• To help protect the environment, my father goes to work by bike every day.

Choose the word whose underlined part is pronounced differently from the others.

• waste

• release

• extinction

• endangered

Choose the word whose underlined part is pronounced differently from the others

• coral

• ecosystem 

• dugong 

• oxygen