21．(2012·太原第一学段测评)As Susan stared at________piles of plastic in her recycling bin，________strong sense of responsibility made her stick to her recycling work.
A．不填；不填 B．不填；a
C．the; a D．the; the
答案：C 考查冠词。第一空特指她垃圾箱的那堆塑料，所以用定冠词；第二空a sense of responsibility“一种责任感”。
22．(2012·吉林市一模)—Jack, this is the third time that you have been late this week.
—Sorry, sir, but I was________for 15 minutes on the way here in the traffic jam.
A. held up B. put up
C. taken up D. given up
答案：A 考查动词短语辨析。hold up“阻塞”；put up“张贴”；take up“开始，从事”；give up“放弃”，根据句意选A。
