17．Sarah and Janet have been friends since they （61）started（start） school．They do everything together：study，read，watch TV，surf the Internet，play sports and listen to music．Anyone （62）who has a problem can ask the other for help．When Sarah was in the （63）third（three） grade，some of the other students made fun of her （64）because she was shy．Janet told the other students to stop （65）making （make） fun of Sarah，and she helped Sarah overcome her shyness．In the fifth grade，Janet had （66）difficulty（difficult） in her maths class．She studied hard，（67）butshe just couldn't understand the homework．Sarah helped Janet （68）with her homework and （69）patiently （patient） explained every exercise to Janet．After six months，Janet did much better and even got（70）an A in the maths exam．

分析 短文描寫了Sarah和Janet他們兩人從上學開始的點點滴滴，他們做什么事都一起做，互相學習，幫助彼此克服困難．

解答 61．started，根據(jù)語境"當他們上學的時候"描述的是過去的動作，因此使用一般過去時started．    
62．who，考查定語從句的引導(dǎo)詞，當先行詞是不定代詞anyone指人時，引導(dǎo)定語從句只能用who．   
63．third，根據(jù)語境表示Sarah三年級，使用Grade Three，或者使用序數(shù)詞修飾grade，因此填third．     
64．because，前后兩句構(gòu)成因果關(guān)系，因此用because引導(dǎo)原因狀語從句．      
65．making，考查動詞短語的搭配，stop doing sth．"停止做某事"，因此使用動名詞形式making．
66．difficulty，根據(jù)所給詞difficult是形容詞，意思為"困難的"，此處是"在某方面有困難"，因此使用其名詞形式difficulty．   
67．but，根據(jù)語境"她認真學習"和"她不明白作業(yè)"構(gòu)成轉(zhuǎn)折的關(guān)系，因此使用but．       
68．with，考查動詞短語help sb．with sth．"幫助某人某事"．     
69．patiently，此處考查副詞修飾動詞explained．    
70．a(chǎn)n，表示"在數(shù)學考試中獲得一個A"，用不定冠詞，由于A是以元音音素開頭的單詞，因此使用an．

點評 對于語法填空這類題，一是懂得分析句子結(jié)構(gòu)，二是知道充當各個句子成分的詞類或詞性，從語法上確定答案，當然，對于某些固定搭配也要牢記，在平時的學習中要多積累這些詞匯或短語，對于句子使用的時態(tài)語態(tài)也要通過語境進行確定．

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