A. problem B. brigade C. click D. layer A. a great deal B. prepare C. splendid D. paste A. mankind B. apple C. programme D. service A. fifth B. after-school C. Bombay D. dagger A. welfare B. on one's mind C. grow D. appearance A. rubbish B. accidentally C. middle school D. sky A. contents B. cabin C. quiet D. sneaker A. noise B. difference C. existence D. purse A. worm B. jerky C. pollution D. challenge A. take a look B. pray C. flat D. pick