A. icy B. refund C. ought D. multiply A. interminably B. double C. concrete D. let down A. cook B. cooker C. rediscover D. in a minute A. ventilate B. skim C. stripe D. opportunity A. formation B. man-made C. ventilation D. tiring A. weightlessly B. fist C. invasion D. isn't A. virus B. tunnel C. lose one's way D. at last A. red packet B. enjoy oneself C. package D. flight A. crucible B. definite C. caller D. colony A. continent B. indeed C. heavy D. economy