A. social climber B. get up C. porter D. Switzerland A. difficult B. methane C. dance D. slept A. painlessly B. route C. up to now D. morning A. er B. go home C. taboo D. liquid A. range B. go back to C. volunteer D. evening A. cook breakfast B. express C. run D. green A. mix B. clever C. cut up D. easy A. go to school B. make a difference C. fried rice D. double A. twenty-five B. breakfast C. have in common D. destroy A. defy B. peasant C. byproduct D. school begins