填空题（共10题，10.0分）21. (1.0分) Fill in the blanks with the properform of the words given in the brackets.A chairperson is ___(response) for thesmooth running of a meeting.

根据句意，“A chairperson is ___ for the smooth running of a meeting”需填入“responsible”，构成“be responsible for”结构，表示“对……负责”。原词“response”为名词，需转换为形容词“responsible”。 答案：responsible。