A. homework B. sticker album C. beneficial D. can't help doing A. sure B. great C. greet D. argue A. player B. plain C. behalf D. upstairs A. current B. past C. always D. discourage A. borrow B. watch TV C. wave D. landlord A. muzzle B. direction C. fasten D. necessity A. population B. workbook C. make effort D. ask A. oar B. help C. typhoon D. Dutch A. phenomena B. dweller C. heavy D. appearance A. laboratory B. finger C. colonel D. CD