UNIT 7 VOCABULARY, PHONETICS, READING, WRITING...GRAMMAR.I/ CHOOSE THE...

17. I / think / we / turn / light / before / leave / room/V/ Choose a, b, c or d to complete the passage belowa, I think we should turn the light before leaving the roomIn order to (31) the amount of energy used, people have invented manyb, I think we should turn off the light before leaving the roomenergy saving (32) appliances. They also use a (33) scheme to show … …c, I think we should turn off light before leaving the roomhow much energy each appliance can save, so that(34) know what to …d, I think we should turn off the light before leaving roomchoose. Besides, they have also been searching for other sources of