A. write down B. fritter C. expression D. involved A. location B. chemistry C. humidity D. unsmiling A. whenever B. petrify C. ask for help D. smart A. social B. Egyptian C. puzzled D. used A. half an hour B. hurry up C. fin D. personnel A. bear B. in a way C. root D. puzzle A. neatly B. leak C. all the time D. prove A. change into B. air conditioner C. advise D. ventilate A. on the other hand B. put up C. never D. according to A. reduce B. saxophone C. relief D. rip off