A. midsummer B. half C. researcher D. Christmas Day A. skim B. use C. pass off as D. fluently A. mainstream B. all one's life C. bottle D. exist A. common B. observation C. er D. outwards A. on the weekend B. identical C. list D. go skating A. forty-six B. upon C. alien D. can A. a lot of B. per C. Pakistani D. Korea A. fairness B. how much C. Niagara Falls D. medical A. rail B. unmanned C. lost D. away A. search B. in trouble C. by ship D. need