1.It was when we were returning home _______ I realized what a good feeling it was to have helped someone in trouble.

A which

B that

C where

D how

解析：选B。B　考查强调句型。句意：在回到家时我们才意识到帮助有困难的人是多么的高兴。强调句型的基本结构为It is/was＋被强调部分＋that＋其他部分。

2.As you go through this book, you ________ that each of the millions of people who lived through World War Ⅱ had a different experience.

A will find

B found

C had found

D have found

解析：选A。A　考查时态。句意：在浏览这本书的时候，你会发现经历过二战的数百万人的经历都不相同。时间状语从句一般遵循“主将从现”原则，as引导时间状语从句时，意思是“当……的时候”，在从句中使用的是一般现在时，所以主句使用一般将来时。

3.Only after talking to two students _________ that having strong motivation is one of the biggest factors in reaching goals.

A I did discover

B did I discover

C I discovered

D discovered I

解析：选B。B　考查倒装句。句意：只有在和两个学生交谈之后，我才意识到拥有强烈的动机是达成目标的最重要的因素之一。位于句首的only修饰时间状语时，全句要进行部分倒装。

4.Video games can be a poor influence if ________ in the wrong hands.

A to leave

B leaving

C leave

D left

解析：选D。D　考查省略。句意：如果电子游戏在不合适的人手中，就可能产生不良的影响。if后面省略了video games are。在时间状语从句，条件状语从句和让步状语从句中，如果从句的主语和主句的主语一致，或者是it，而且从句必须含有系动词be，从句的主语和be必须一起省略，不可只省略主语而保留整个谓语，也不可只保留主语而省略谓语。

5.I wasn't able to hide my eagerness when I ________, “What do you wish me to do now?”

A ask

B have asked

C am asking

D asked

解析：选D。D　考查时态。句意：当我问道，“现在你想让我干什么？”，我不能掩饰自己的迫切心情。when,while引导的时间状语从句的主从句时态一致，当主句的动作发生在过去时，从句中的时态也应该是过去时。

6.You have to know _________ you're going if you are to plan the best way of getting there.

A what

B that

C where

D who

解析：选C。C　考查宾语从句。句意：如果你计划到达某地的最佳方案，你必须先知道你想要去哪？ where引导宾语从句，在从句中用作状语。在引导名词性从句时，what通常用作主语或者宾语；that在从句中不充当成分，只作连接词；who指人。Going后面缺地点状语，故选where

7.It is important to remember that success ______ a sum of small efforts made each day and often _____ years of achieve.

A is; takes

B are; takes

C are; take

D is; take

解析：选A。A　考查主谓一致。句意：最重要的是记住，成功是将每天付出的一小点努力积累起来，常常要花费多年才能实现。that引导宾语从句，在从句中的主语是success，是不可数名词，因此从句的谓语动词使用单数。根据连接词and可知is和takes是并列谓语。

8.He must have sensed that I ________ him. He suddenly glanced at me and said quietly, “Why are you staring at me like that?”

A would look at

B looked at

C was looking at

D am looking at

解析：选C。C　考查时态。句意：他一定是感觉到了我正在看他。他突然瞥了我一眼，然后平静地说：“为什么这样盯着看我？” must have done是对过去情况的推测，根据主从句试题一致可知that后面应该使用过去时，再根据后面语境，“为什么这样盯着看我？”，可知此处为过去进行时。

9.It is a truly delightful place, _________ looks the same as it must have done 100 years ago with its winding streets and pretty cottages.

A as

B where

C that

D which

解析：选D。D　考查定语从句。句意：这真是一个令人开心的地方，它看起来和一百年前一模一样，有着蜿蜒的街道和漂亮的小屋。which代替先行词place，在定语从句中用作主语，引导非限制性定语从句。注意：定语从句关系词的确定是看先行词在从句中所充当的成分而确定。

10.When the clerk saw a kind face wrinkled in an apologetic smile, she stood rooted to the ground, _______ whether to stay or leave.

A wondering

B wonder

C to wonder

D wondered

解析：选A。A　考查非谓语动词。句意：当店员看到善意的脸上挂着满怀歉意的微笑时，她呆呆地站在原地，想着是去还是留。wondering 是现在分词作伴随状语，修饰动词stood。非谓语的考查要注意抓逻辑主语，本句的逻辑主语为she,故为主动，且表伴随。

11.Always ________ in mind that your main task is to get this company running smoothly

A to keep

B to have kept

C keep

D have kept

解析：选C。C　考查祈使句。句意：请时刻牢记，你的首要任务是使公司顺利运作。keep in mind 记住，固定短语，在此处是祈使句。祈使句表示请求、命令、要求等，谓语动词用原型。本句中that后面是mind的同位语从句。

12.I had a strong desire to reach in and play with the toy, but ________ thankfully by the shop window.

A am held back

B held back

C hold back

D was held back

解析：选D。D　考查时态和语态。句意：我有一种强烈的想进去玩玩具的想法，但是我被橱窗拦住了。前面had 是一般过去时，此处是并列谓语，也应该使用一般过去时；hold back和主语I之间又是被动关系，所以使用一般过去时态的被动语态。

13.________ the job takes a significant amount of time, most students agree that the experience is worth it.

A If only

B After

C Although

D In case

解析：选C。C　考查状语从句。句意：虽然这项工作花费大量的时间，但是许多学生认为这次经历是值得的。if only 如果……就好了（常用于虚拟语气中）；after 在……之后；although虽然；in case 以防万一。根据句意可知选C。

14.Sometimes I act as a listening ear for fellow students ________ what is bothering them.

A to talk over

B talked over

C talk over

D having talked over

解析：选A。A　考查非谓语动词。句意：有时候我充当一个倾听者，让同学们通过向我倾诉，释放心头的烦心事。for sb to do sth 是不定式的复合结构，在句中作定语，修饰前面的a listening ear。

15.That's why I help brighten people's days. If you _________, who's to say that another person will?

A didn't

B don't

C weren't

D haven't

解析：选B。B　考查省略句。句意：这就是我帮助人们开心快乐的原因。如果你不这样做，谁会说别人会这样做呢？ If you don't 相当于If you don't help brighten people's days。