A. take in B. protective C. circuit D. pollute A. acrobatic B. uncomfortably C. kindness D. urban A. rid B. up and down C. rust D. droop A. first of all B. ground C. involve D. snap A. employ B. heavy rain C. pack D. adjustment A. not B. irritation C. assorted D. sb can't wait A. staggering B. enjoyment C. librarian D. reservation A. screw B. come out C. up to now D. on guard A. burglar B. tournament C. make a mistake D. scientist A. take out the rubbish B. vibration C. suit D. pollution