Exercise 1:Choose the best option to complete each of the following sentences. 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 install B. installed C. installing D. install 5/Scientists are looking for an ________way to reduce energy consumption. A. effect B. affect 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 order to save electricity, an ordinary 100-watt light bulb can be replaced by a(n) ________. A. energy-saving bulb B. energy-save bulb C. saving energy bulb D. save- energy bulb 9/You should get a (n)________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 trees 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