A. challenging B. edifice C. roof D. agency A. Austrian B. reproduce C. mineral D. arduous A. second floor B. epithet C. fall behind D. pay phone A. paste B. of one's own C. trickle D. in a word A. parking B. Tokyo C. Macintosh D. explosive A. since B. saliva C. turn off D. should A. plea B. engineering C. advertisement D. neither A. native B. quantities of C. descendant D. the other day A. geologist B. central C. shilling D. zebra crossing A. tissue B. hockey C. wow D. ancestor