A. traffic light B. communicate C. garbage D. a great number of A. food for thought B. emotionally C. starvation D. ton A. mark out B. academic C. at dusk D. electricity A. wheat B. rambling C. radioactive D. dove A. sounding B. factory C. laugh at D. west A. sway B. training C. respect D. cellar A. continental B. used C. blow out D. be careful with A. savannah B. on the contrary C. recycle D. rust A. let out B. earn one's living C. soundly D. leaky A. schoolyard B. varying C. fish D. energy