1)can you turn the light? it's too dark A on B off C in D for 2)i suggest showers instead of taking bath A take B taking C to take D to taking 3)what are you looking ? my picture book i've lost it A on B off C in D for 4)a new air-conditioner will be tomorrow morning A to intall B installed C installing D install 5)scientists are looking for an way to reduce energy consumption A effect B effection C effective D effectively 6)they are completely short of water now a number of people have died because of this A shortage B short C shorten D shortly 7)if you want to save money you should the amount of water your family uses A increase B reduce C adapt D repair 8)in oder to save electricity an ordinary 100-watt light bulb can be replaced by a A energy-saving bulb B energy-save bulb C saving energy bulb D save-energy bulb 9)you should get a to make sure there are no cracks in the pipes A plumber B mechanic C electrician D consumer 10) you take the train instead of the bus?it's faster and cheaper A why not B why don't C how about D let's 11)if we less paper we the number of treets in the forests A used/will save B use/can save C can use/save D use/can 12)she won't take all the suitcases she likes to travel light A so B but C because D therefore 13)she is very tired she has to finish her homework A moreover B so C and D however 14)is he an actor a singer?an actor A and B or C with D so 15)he was tired he took a rest before continuing the work A so B and C but D if 16)who looks your children when you are away from home? A for B at C after D to 17)why doesn't she go to with her university study? A in B at C to D on 18)after coming home she cleaned the floor cooked dinner A but B however C moreover D and 19)they didn't understand the matter she didn't ask for help A but B however C moreover D and 20)how about posters on energy saving and hanging them around our school? A make B making C to make D to making