兩句的差別是連詞and。分析句子結(jié)構(gòu)可知，①中空格處為現(xiàn)在分詞作伴隨狀語；②中空格處與volunteered并列作謂語。故①填donating；②填donated。分析①Hevolunteeredtohelpcontroltraffic,________(donate)anhourofhistimeeveryweek.

②Hevolunteeredtohelpcontroltraffic,and______(donate)anhourofhistimeeveryweek.示例兩句的差別是連詞and。分析句子結(jié)構(gòu)可知，①句為句式“祈使句＋and＋陳述句”；②句為分詞短語作條件狀語。故①填Call；②填Calling。分析①________(call)metomorrowandI’llletyouknowthelabresult.

②________(call)metomorrow,I’llletyouknowthelabresult.示例兩句的差別是連詞so。分析句子結(jié)構(gòu)可知，①句為獨立主格結(jié)構(gòu)作原因狀語；②句so連接兩個并列句，空格處所填詞應(yīng)與第二個并列分句的謂語動詞一致。故①填leading；②填led。分析①Theguide________(lead)theway,wehadnotroublegettingoutoftheforest.

②Theguide________(lead)theway,sowehadnotroublegettingoutoftheforest.示例兩句的差別是連詞if。分析句子結(jié)構(gòu)可知，①句為獨立主格結(jié)構(gòu)作條件狀語；②句為if引導(dǎo)的條件狀語從句。故①填permitting；②填permits。分析①Thepartywillbeheldinthegarden,weather________(permit)．②Thepartywillbeheldinthegarden,ifweather________(permit)．示例三句的差別是逗號后面的部分。分析句子結(jié)構(gòu)可知，①句為and連接兩個并列句，通過時態(tài)、語態(tài)的分析，應(yīng)用一般過去時的被動語態(tài)；②句為獨立主格結(jié)構(gòu)(with復(fù)合結(jié)構(gòu))；③句為現(xiàn)在分詞短語作伴隨狀語。故①填wasfixed；②填fixed；③填fixing。分析①Jimwaslisteningattentivelytothelecture,andallhisattention________(fix)onit.

②Jimwaslisteningattentivelytothelecture,(with)allhisattention________(fix)onit.

③Jimwaslisteningattentivelytothelecture,______(fix)allhisattentiononit.示例兩句看似結(jié)構(gòu)一致，但仔細(xì)分析卻是大相徑庭。①句為and連接三個并列謂語；②句為and連接兩個伴隨狀語。故①填sat；②填talking。分析①Hewentintotheroom,________(sit)atthetableandbegantoreadne