12. _____ you’re early you can’t be sure of getting a seat. (QE07-04-31)

        A. If    B. Unless   C. When   D. Because

        【答案】B此题考查的是连词辨析。根据题意，应是：除非你早到，你无法确定一定有座。Unless”除非”.

        13. The man said he would hit me ___ I told him where the money was. (QE92-38)

        A. until    B. unless    C. soon after    D. as

        【答案】.B 句意为“那个男人说除非我告诉他钱在哪里，否则他会袭击我。”unless“除非”。

        14. ___ I’m mistaken, I’ve seen that man before. (QE01-40)

        A. Unless   B. If   C. Because   D. Provided

        【答案】：A。unless：若不，除非。You will fail unless you work harder.你若不更加努力就会失败。I won’t phone you, unless something unforeseen happens.我不打电话给你，除非发生意外。本句话的意思是“如果我没有弄错的话，我以前见过他。”因此A 最符合题意。provided 及providing “只要，以…为条件”后接that从句中的that 可以省略，一般都可以由if 来代替。We shall go provided （that） the weather is fine .要是天晴，我们就去。Provided （that） no objection is raised, we shall hold the meeting here.如果没有人反对的话,我们就在这开会。because：因为

        15. We’ll be only too glad to attend your party ___ we can get a baby-sitter. (QE03-11-30)

        A. so far as   B. provided that   C. unless   D. except that

        【答案】B  本句考查连词的用法。provided that：假如，以……为条件，相当于if，例如： I will lend you my book provided that you keep it clean．只要你保证书的干净整洁，我就把书借给你。本句的意思是：“如果我们能找到保姆的话，我们将非常乐意参加您的宴会。”因此B最符合题意。unless：除非，如果不……。except that：除了……Your  article is quite good except that there are several spelling mistakes．你的文章很好，除了几个拼写错误。so(as)far as：(表示程度，范围)就……，尽……至于……，as far as I know就我所知。

        16._____ we stood at the top of the building, the people below were hardly visible.

        A. As   B. Although  C. Unless  D. In spite of

        【答案】A 当我们站在楼顶的时候，在下面的人群很难进入我的视线。

        17.I didn’t go abroad with her _____I couldn’t afford it.

        A. because  B. although  C. unless  D. in spite of

        【答案】A 我不想和她出国，因为我负担不起。

        18. The metal ________was first used was copper ______ it was easily obtained in its pure(纯的)state.

        A. what…because…  B. that…where…  C. which…as…  D. that…when…

        【答案】C 最开始被使用的是铜，因为它很容易得到纯的状态。

        19. A solid is different from a liquid ___ the solid has its definite shape. (QE05-11-39)

        A. in that    B. in which    C. in what    D. because of which

        【答案】A本题考查的是in that引导原因状语从句的用法。In that由于，因为。固体是不同于液体的，因为固体是有确定的形状。

        20. We'd better hurry ______ it is getting dark.

        A. and   B. but      C. as      D. unless

        【答案】C 因为天快黑了，我们最好快一点。

        21. Speak to him slowly _____ he may understand you better.

        A. since    B. so that    C. for     D. because

        【答案】B 慢慢对她说，以便于他能够更好的理解。

22. I wrote it down ___ I should forget it. (QE02-27)

        A. in case   B. in case of   C. in order that   D. for fear of

        【答案】A。in case:（连词）免得，以防万一。本句的意思是：“我写了下来，免得忘了”。又如：Keep the window closed in case it rains.把窗子关好，以防下雨。in case of (介词短语)：假使、如果发生。In case of fire, ring the alarm bell.如遇火警，即按铃。In order that （连词，引导目的状语从句）为了…In order that he should not be late , his mother woke him at 6. 为了不使他迟到，母亲在６点种叫醒他。for fear of:（介词）生怕、以免。She left an hour early for fear of missing her train. 她提早一小时离开以免误了火车。