A. pollute B. look back at C. at that moment D. wipe out A. ahead of B. restrict C. determine D. attractive A. hurricane B. painter C. besides D. vie A. wire B. trade C. ray D. shake A. link to B. zip C. helmet D. in one's view A. summary B. point C. flight attendant D. goods A. layer B. request C. someone D. lull A. profit B. tradition C. investigation D. cautious A. recycle B. mainstream C. squirrel D. appear A. edition B. teach C. vice D. snowball