A. in a low voice B. outside C. begin D. fall behind A. Italy B. by C. at night D. identification A. train B. injection C. complex D. threatening A. sensor B. in terms of C. every D. class A. boat B. pal C. prevent from D. clarify A. give away B. Malaysia C. refresh D. gate A. accidentally B. porpoise C. latitude D. walk A. wolf B. training C. detective D. game A. immigrant B. plug in C. listen D. regret A. commissary B. America C. generation gap D. soccer