A. EXPENSIVE B. DIFFERENT C. ABUNDANT D. CONVENIENT A. EXPEN...

7. A. expensive B. different C. abundant D. convenient8 A. petroleum B. advantage C. enormous D. tendency9 A. paddle B. invent C. display D. cartoon10 A. atmosphere B. plentiful C. effective D. naturalC: GRAMMAR AND VOCABULARY.I. Choose the best answer by circling its corresponding letter A, B, C or D.