1. Our flight from Amsterdam to London was delayed ______ the heavy fog. A. because B. since C.as D. because of 2. Electricity, gas and water are not luxurious ______ necessary. A. and B. so C. but D. or 3. Why don’t we ______ the meanings of these words in dictionaries? A. look forward B. look up C. look at D. look for 4. I can hear the news on TV well. Can you turn _____ the volume a bit? A. on B. off C. up D. down 5. I had my sister ________ the dishes last night. A. wash B. washes C. washed D. washing 6. I failed my exam although I worked really hard for it. I am so ___________________. A. disappoint B. disappointed C. disappointment D. disappointing 7. If more and more trees ___________, the climate ___________ A. die - changes B. die – will change C. will die - changes D. will die – change 8. Lam studies every subject very hard. ______, she won her school’s Best Student Prize this year. A. So B. Because C. However D. Therefore 9. There are now vast areas of wasteland all ________ the world. A. in B. over C. above D. of 10. “How about organizing a show to raise money?” - “__________________________” A. Well done B. Why not? C.That’s very kind of you D. That’s a good idea. 11. I heard traveling by plane. I always feel tired when it takes _____. A. by B. on C. off D. out 12. Hung is sick. ______________, He can’t go to school. A. Therefore B. and C. but D. because 13. We canceled the picnic __________. A. because it rained heavy B. because of the heavily rain C. because it was heavy raining D. because it was raining heavily 14. What makes us __________ most is people use some dangerous chemicals to put in food. A. to worry B. worrying C. worries D. worried 15. ______ is caused by the injurious smoke emitted by cars, buses, trucks, trains and factories. A. Water pollution B. Land pollution C. Solar energy D. Air pollution