^{Xây dựng khóa lưỡng phân phân biệt các nhóm động vật có xương sống}

reuse ; electricity ; water ; plastic ; free ; picking up

Our planet is in big trouble – animals are disappearing, the sea and the air are dirty. But there are many different things we can do to protect the environment. First, recycle everything you can. Don’t throw away plastic bottles, glass jars, cardboard boxes or cans. We can (1) _______ them to store food, toys or grow flowers. Second, why not walk or cycle to school or work? It’s (2) _______, good exercise and good for the environment. Third, don’t waste (3) _______. Switch the lights off when you leave the room. And keep the city clean by (4) _______ litter off the streets. When you go shopping, bring your own bags instead of taking (5) _______ bags. Together we can make a big difference and help save the planet.

B. Rewrite the following sentences without changing the meaning.

15. It’s not a good idea to go diving along because it’s quite dangerous.

16. It’s necessary for you to drink plenty of water when you’re out in the sun all day.

17. It’s a good idea to have a guidebook before you visit a city.