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1. Many people agree that _____ knowledge of English is a must in _______ international trade today.
   A. a; /         B. the; an        C. the; the        D. /; the
2. Please retell the story _______ your own words.
   A. with        B. by           C. in            D. at
3. It is wise to have some money ___________ for old age.
   A. put away    B. kept up       C. given away     D. set up
4. ---“ Mary, you clean the classroom today, __________ ?”
  --- “ But I cleaned it yesterday.”