A. often B. naive C. officious D. bookseller A. snatch B. good-bye C. conservative D. play the piano A. indifferently B. building block C. around D. easy A. at B. cook breakfast C. joke around D. optimistic A. strengthen B. smile C. walk D. missile A. painlessly B. neatly C. school is over D. interstellar A. lunch B. be opposed to C. pneumatic D. wreath A. school begins B. luggage C. cap D. electric A. animal-lover B. scheme C. difficult D. tropical A. evening B. during C. decide D. sewage