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20．I don't know what it is．No matter（51）whenI go to a post office and no matter where the post office is，I always find myself（52）standing（stand） in line behind someone who has a lot of business to do．
One day，I had to buy a couple of st amps，but I had to wait behind an old lady who took fifteen minutes（53）to finish（finish） a form that a child could do in one minute．Feeling（54）thatI could not stand waiting in such a line any longer，I decided to join（55）anotherone．It seemed twice as（56）longas the first line，but at least it was moving．It turned out to be the worst choice I had ever made．As soon as I lost my place in the first line，the one I joined slowed to a stop．I had no choice（57）butto wait behind a schoolboy（58）whowas taking half an hour to choose a new set of postcards．At last it was my turn．I nearly jumped for joy．Then the clerk behind（59）thecounter，a middle-aged fat guy，stood up，pushed forward a printed sign saying"Position Closed"and（60）said（say） without a smile，"Sorry，going to lunch．"

分析 每次我去郵局，總是排在隊(duì)伍的后邊．買郵票時(shí)由于前面的老婦人太慢，我換了另?xiàng)l隊(duì)，好不容易排到我時(shí)卻到了午餐時(shí)間．

解答 1．when 考查連詞．No matter when的意思是"無論何時(shí)"，故填when．
2．standing 考查非謂語．find是及物動(dòng)詞，其后要跟賓語myself，stand的邏輯主語是我，兩者之間是主謂關(guān)系，所以用現(xiàn)在分詞standing在句中做賓語補(bǔ)足語．
3．to finish考查不定式．在英語中，it takes/took sb．+時(shí)間+to do sth．，故填to finish．
4．that 考查賓語從句．后文句子是feel的賓語從句，從句中是個(gè)主謂結(jié)構(gòu)的句子，所以用that來引導(dǎo)．．
5．a(chǎn)nother 考查代詞． 在英語中，another泛指另一個(gè)．根據(jù)句意我決定加入到另一個(gè)隊(duì)伍，所以答案填another．
6．long 考查固定結(jié)構(gòu)．在英語中，as long as是固定搭配，意思是：和…一樣長．
7．but 考查固定結(jié)構(gòu)．在英語中，have no choice but to do sth．是固定搭配，意思是"除了…別無選擇"．
 8．who 考查定語從句． 本句中的先行詞是schoolboy在定語從句中做主語，所以關(guān)系代詞用who來引導(dǎo)．
9．the 考查冠詞．在本句中，由于counter是名詞，需要一個(gè)限定詞修飾，故填the，這里是特指．
10．said 考查時(shí)態(tài)和語態(tài)．分析句子，可知此處要用一個(gè)謂語動(dòng)詞．由于前面的動(dòng)作都是表示過去，故用一般過去時(shí)，填said．

點(diǎn)評 語法填空是通過語篇在語境中考查語法知識的運(yùn)用能力，在解題前應(yīng)快速瀏覽短文掌握大意，在讀懂短文的基礎(chǔ)上，結(jié)合短文提供的特定的語言環(huán)境去逐句分析．要解決好語法填空，離不開堅(jiān)實(shí)的語法知識，有了堅(jiān)實(shí)的語法知識才能對語言進(jìn)行正確的分析和判斷，從而答對題目．

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