A. grade B. go in C. good-looking D. No smoking A. impact B. rode C. spell D. capital A. not B. take notice of C. beach D. valley A. universe B. he C. pretend D. aquaplane A. last B. grey C. impossible D. tongs A. commercial B. year C. revise D. decrease A. professor B. biochemist C. air conditioning D. hi A. protest B. part C. environmental D. Chinese A. very B. slam C. do shopping D. woods A. silk worm B. Ms C. display D. cellar