A. Can I help you B. register C. Antipodes D. cone A. the Yangtze River B. road C. mystery D. Sahara A. sign B. upwards C. self-discipline D. preliminary A. attack B. solve C. planned D. organize A. babysit B. spire C. doorknob D. Canberra A. point at B. inch C. similarity D. keep up with A. basement B. experiment C. snatch D. together A. distinct B. glance C. abandon D. temporarily A. spark B. prolong C. get D. portray A. arena B. rock climbing C. dismay D. fiction