. People all over the world are working to help save ________ animals from extinction. 

A. danger B. endangered C. dangerous D. dangerously 

2. A(n) ___________is the total amount of greenhouse gases that are generated by our actions. 

A. carbon footprint B. carbon dioxide C. global warming D. ecosystem 

4. Customers shouldn’t use ____ products. 

 A. single-use B. single-used C. singled-use D. single-using  

5.  You should look at both sides carefully ___________ you cross the street.

A. until B. after C. as soon as D. when

6. Around 7 million ________ of plants and animals exist on the Earth. 

A. means B. classes C. styles D. species 

7. One of the   ___ ways to reduce your carbon footprint is to walk, cycle or use public transport whenever you can.

A. effective B. effect C. effectively D. effectiveness

Mark the letter A, B, C or D to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions 

1. The new laws to conserve wildlife in the area will come into force next month.

A. pollute B. destroy C. eliminate D. protect

2. Many human activities harm natural habitats.

A. non-living B. unpolluted C. clean D. man-made

3. It's easy to waste time browsing online when shopping, isn’t it?  

A. protect B. conserve C. save D. spend