A. submerge B. bird C. hydrogen D. play the piano A. season B. shallow C. put forward D. hot dog A. playing B. punctuality C. eighteen D. go on a trip A. at the edge B. plant C. publish D. close A. vertical B. dynasty C. clerical D. summer A. keep fit B. farm the land C. beast D. striker A. archaeology B. little C. cliche D. sales department A. fist B. pick apples C. probably D. imperative A. sky B. classmate C. rain D. inflatable A. winter B. physiological C. wise D. be strict with