4.Small farms and lack of modern technology have _______ agricultural production.

　　A)blundered B)tangled

　　C)bewildered D)hampered

　　5.There was something wrong with the traffic signal.Our bus was_______ for nearly half an hour.

　　A)held on B)held back

　　C)held in D)held up

　　6.When Jane fell off the bike，the other children_______.

　　A)were not able to help laughter

　　B)could not help but laughing

　　C)could not help laughing

　　D)could not help to laugh

　　7.The story was so touching that I could hardly _______ my tears.

　　A)hold on B)hold on to

　　C)hold up D)hold back

　　8.Should you require any further details at this time，please do not_______ to contact me.

　　A)void B)hesitate

　　C)delay D)prevent

　　9.The discussion quickly became a very _______ argument about increasing price.

　　A)heated B)roaring

　　C)warm D)boiling

　　10.The painting was a valuable family possession，which had been _______ from generation to generation.

　　A)handed over B)handed out

　　C)handed down D)handed across

　　1.【答案】C)。

　　【解析】A)hang up“掛斷(電話)”，B)hang about“閑蕩”，C)hang on“堅(jiān)持下去”，D)hang onto“抓緊(某物)”。可見選項(xiàng)C)hang on符合題意，是正確答案。句意：學(xué)好英語(yǔ)不容易，但如果你堅(jiān)持下去，你最終能成功。

　　2.【答案】B)。

　　【解析】句中有情態(tài)動(dòng)詞、助動(dòng)詞或to be時(shí)，rarely等要放在這些動(dòng)詞之后、主要?jiǎng)釉~之前，但在省略句中，這類詞要放在情態(tài)動(dòng)詞、助動(dòng)詞或to be之前。句意：舊金山夏天通常涼爽，洛杉磯夏天很少有涼爽的時(shí)候。

　　3.【答案】C)。

　　【解析】A)go in for“從事，愛好”，B)hold on to“堅(jiān)持，抓緊”，C)put up with“容忍，忍受”，D)keep pace with“與……保持一致，跟上”，根據(jù)以上辨析可知，選項(xiàng)C)put up with符合題意要求。句意：孩子們?cè)诩視r(shí)，我們不得不忍受許許多多的喧鬧聲。

　　4.【答案】D)。

　　【解析】D)hamper意為“阻礙，束縛”。其他三個(gè)動(dòng)詞的意義是：A)blundered“盲動(dòng)，脫口而出”;B)tangled“糾纏”;

　　C)bewildered“迷惑”。句意：小農(nóng)場(chǎng)以及缺乏現(xiàn)代技術(shù)束縛了農(nóng)業(yè)的生產(chǎn)。

　　5.【答案】D)。

　　【解析】短語(yǔ)動(dòng)詞hold up意為“耽擱，受阻，使停止”，符合題意。句意：交通燈出了故障，我們的車被塞近半小時(shí)了。