41.A. Solar panels will be installed on the roof of our house next week
42.B. Will cracks on the water popes be checked in two days ( by the plumber)?
43.D. These chemicals are sold everywhere in my hometown
44.C. The old thermal power plant will be destroyed at the end of this year
45.B. The road to our village will be widened next year
46.C. Biogas will be used for cooking and heating at this time next month
47.A. The first prize was got at the competition
48.B. Saving energy is one of the best ways to conserve natural resource
49.B. Don’t leave the fridge door open because cold air escapes and this uses a lot of electricity
50.D. Turn off all the lights every time you leave the room