A. track B. enlightened C. sprain D. go A. astronomy B. fairness C. Nile D. answer A. not at all B. train C. explorer D. overwhelm A. athlete B. gate C. wildlife D. separate from A. pocket B. special C. recycling D. sugary A. sailor B. time C. art D. bookshop A. end B. fulfil C. impoverish D. self-improvement A. overpopulated B. green with envy C. tell D. specimen A. opera house B. moon cake C. cheat D. copper A. bullion B. saliva C. similarly D. collect