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 Though he was very excited about being elected as president of the student association, many extra responsibilities have been __________ him ever since then.