Question 13. My classmates _________ more friends if they joined youth clubs.

A. would make           

B. made          

C. will make   

D. make

Question 14. It was so hot that I had to _________ my jacket.

A. put on        

B. get out       

C. take off      

D. turn off

Question 15. People nowadays are interested _________ saving money and natural resources.

A. with

B. to

C. on

D. in

Question 16. Living in the countryside is _________ than in cities.

A. most peaceful

B. less peaceful

C. least peaceful

D. more peaceful