A. volcanic B. progress C. after class D. valuable A. coin B. gear C. puzzle D. surface A. with B. man-made C. group D. user-friendly A. in general B. fast-food restaurant C. have a look D. tunnel A. had better B. person C. headlight D. hypocrisy A. dollar B. Nazi C. blacken D. swim A. teens B. UK C. feather D. value A. occurrence B. book C. pleasure D. thrifty A. prescription B. great-grandma C. tidy up D. approve A. piece B. interest C. fox D. ouch