15. C

16. A

17. Remember to turn off the lamps before leaving as lighting costs us too much money.

18 . We should not take a bath because a bath uses twice as much water as a shower.

19. religious

20. arrive

21. protect 

22. explained

23. participants.

24. disadvantage

VOTE 5 SAO + CẢM ƠN VÀ CHO MK XIN CÂU TRẢ LỜI HAY NHẤT NHÉ!

`text{15. C car must turn right}`

`text{16. A there's is a petrol station ahead}`

`text{17. Remember to turn off the lamps before leaving as lighting costs us too much money}`

`text{We should not take a bath because a bath uses twice as much water as a shower}`

`text{19. religious}`     

`text{20. arrive}`

`text{21. protect}`

`text{22. explained}`

`text{23. participants}`

`text{24. disadvantage}`