A. helpless B. oxygen C. boy D. topical A. friend B. calculate C. communicate D. catastrophic A. rusty B. average C. sheet D. sister A. grand B. teacher C. cut out D. bedtime A. farmer B. fast asleep C. patience D. work out A. What's worse B. living C. China D. act A. lad B. top C. doctor D. delay A. tangible B. chemistry C. couch D. Singapore A. accompany B. face C. America D. presenter A. That's OK B. driver C. invent D. canteen