A. seventeen B. inventor C. by chance D. bond A. artist B. tentative C. keep on D. in advance A. barbecue B. study C. shut off D. coring bit A. conceive B. simplify C. dozen D. Danish A. lots of B. commercialization C. helicopter D. poem A. ensue B. hide C. story D. amass A. investigate B. methane C. trial D. scientist A. deaf B. pathologist C. terrorist D. afford A. invention B. guidance C. seasick D. indoor A. university B. background C. toast D. crest