A. formidable B. paper C. next door D. airmail A. underestimate B. geology C. over there D. outdoor A. Japan B. explanation C. sweep the floor D. turbulent A. almost B. in a row C. clean the floor D. NASA A. lose weight B. hurry C. ground floor D. be short for A. floor B. privilege C. snack D. gel A. Wet floor B. happily C. lean D. father A. out of date B. court C. knock on the door D. replace A. practice B. the poor C. daily D. sunset A. the Spring Festival B. explosion C. carried D. first floor