A. explorer B. formidable C. linguist D. the White House A. aerial B. positively C. first name D. preposition A. receipt B. with the help of C. physiological D. settler A. sideways B. electrode C. Indonesia D. remark A. envision B. standard C. uncertain D. loyal A. drug B. blow out the candles C. get around D. aside A. currency B. steadily C. Mongolian D. charity A. safety B. vivid C. desertification D. structure A. theirs B. speech C. stepmother D. omit A. cruelty B. I'll C. space travel D. thanks to