A. adjustment B. sentence C. can't help doing D. quarter A. acid rain B. fertilizer C. hesitate D. air tank A. adequate B. absolute C. inform D. mountain A. unforeseen B. boring C. dot D. survive A. persecute B. pollution C. order D. billion A. excitement B. in the future C. stress D. value A. scholarship B. change C. strangely D. have to A. stumble B. put forward C. cube D. didn't A. find one's way out B. distraction C. lounge D. shirt A. listen and do B. parade C. entertainment D. target