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。D.keeping【答案】 C 【解析】【分析】句意:我們必須采取行動(dòng)來(lái)防止污水流入河流。keep… from阻止; take action采取行動(dòng);空格后的非謂語(yǔ)動(dòng)詞部分是表示采取行動(dòng)的目的,所以應(yīng)該用動(dòng)詞不定式,故選C?!军c(diǎn)評(píng)】考查不定式做目的狀語(yǔ)。25.Please keep ___________ and never give up. One day we will realize our big dream. A.tryB.triedC.tryingD.to try【答案】 C 【解析】【分析】句意:請(qǐng)堅(jiān)持嘗試,不要放棄。有一天我們將會(huì)實(shí)現(xiàn)我們偉大的夢(mèng)想。keep doing ,固定短語(yǔ),故選C?!军c(diǎn)評(píng)】此題考查固定短語(yǔ)keep doing。26.Don39。t forget _____ off the lights and air conditioner when you leave. A.turnB.to turnC.turningD.to turning【答案】 B 【解析】【分析】考查動(dòng)詞短語(yǔ)的辨析。句意:當(dāng)你離開(kāi)的時(shí)候,不要忘了關(guān)燈和空調(diào)。forget to do ;forget doing .。根據(jù)句意 when you ,可知你還沒(méi)有去做關(guān)燈這件事,故選B?!军c(diǎn)評(píng)】此題考查動(dòng)詞短語(yǔ)辨析。注意forget to do doing 。27.At times, parents find it difficult ________ with their teenage children A.talkB.talkedC.talkingD.to talk【答案】 D 【解析】【分析】句意:有時(shí),人們發(fā)現(xiàn)與青少年交談是有困難的。 find+it+adj.+for sb.+to do sth”發(fā)現(xiàn)做某事是….., “(it做形式賓語(yǔ),to do不定式做真正的賓語(yǔ))。故選D【點(diǎn)評(píng)】考查非謂語(yǔ)動(dòng)詞,以及句型find+it+adj.+for sb.+to do sth的應(yīng)用。28.—I39。m planning ____ the weekend with my grandparents, Mom.—Oh, don39。t ____ to buy them some nice food.A.to spend, forgetB.spending, forgetC.to spend, remember【答案】A 【解析】【分析】這題考查動(dòng)詞的用法,第一空plan后面接不定式,第二空是否定祈使句,用don39。t+動(dòng)詞原形,句意是:—我計(jì)劃和祖父母一起度周末?!?,別忘了給他們帶些好吃的。29.The boy who looks nice ________ white hasn39。t decided ________ next. A.in。 how to doB.in。 what to doC.on。 what to do itD.on。 how can I do【答案】 B 【解析】【分析】句意:穿白色衣服的男孩還沒(méi)有決定下一步該怎么做。in+顏色詞,表示“穿戴”,on沒(méi)有這個(gè)用法,可排除CD選項(xiàng)。疑問(wèn)詞+不定式 結(jié)構(gòu)。how to do怎么做,問(wèn)方式,do后必須加賓語(yǔ),常用it,即how to do it;而what to do做什么,問(wèn)事情,what本身就是do的賓語(yǔ),后面不加名(代)詞。根據(jù)句意結(jié)構(gòu),可知,故選B?!军c(diǎn)評(píng)】考查疑問(wèn)詞+to do和介詞辨析題。30.Sue practices ______ the violin hard and often gives wonderful performances. A.playB.playedC.to playD.playing【答案】 D 【解析】【分析】句意:Sue努力練習(xí)拉小提琴并經(jīng)常做精彩演出。Practise doing ?!军c(diǎn)評(píng)】考查動(dòng)名詞的用法,掌握practice doing結(jié)構(gòu)。