1) if we leave the tap on, we, ....................................................... a) wasting water b) wastes water c) waste water 2) If you ................. water at the top of Mount Everest, it starts to boil. a) heats b) heating c) heat 3) If we heat water, it .......................................... a) boils b) boiled c) boiling  4) If you recycle, you ............................... the environment. a) helps b) help c) helping 5) When you heat ice, it ......................... a) melting b) melted c) melts

Zero conditional

列印
嵌入

排行榜

視覺風格

選項

切換範本

恢復自動保存: ?