A. have a cold B. biogas C. fibre D. sell A. how long B. safeguard C. energe D. bring out A. secondary school B. ups and downs C. most D. cost A. age B. believe C. both D. laborer A. do morning exercises B. steep C. bush D. pound A. cherub B. twenty-five C. penny D. indulge A. videophone B. waitress C. since D. game A. long-eared B. retire C. analytical D. pen friend A. may B. pay C. knowledge D. vulnerable A. because B. ruler C. wound D. wrong