A. zoology B. nationality C. distinctive D. difficult A. climax B. standard C. fold D. crowd A. manufacture B. look out of C. edition D. contain A. set free B. engineer C. wretched D. simplify A. howl B. sip C. rapidly D. approximately A. yum B. realm C. as as D. announcement A. linguist B. in response to C. complete D. handle A. duck B. twice C. have difficulty doing D. put on A. body B. ventilation C. engrave D. linguistics A. substitute B. epidemic C. influential D. lead to