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Fill in the blanks with the expressions given below. Each expression can be used only once. Just write the letter that represents the expression.( 只写字母代号即可 ) A. be serious about B. make sense C. run into D. distinguish between E. thrust upon F. be attracted to G. get lost H. feel obliged to I. looked upon as J. was allergic to When you__________ a friend that you haven't seen for a long time and have a good chat with him, you may feel very happy and delighted.