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 __________.