1.Let’s buy our tickets while I still have ___.
A. a little money to leave B. little money left
C. a few dollars left D. few dollars to leave
【答案】C。B项和D项中的little和few均为否定含义，与句意不符，排除。C项为have sth. left用法，意思是：“还剩下……”。这里have a few dollars left的意思是“还剩下几个美元”，left的过去分词是leave，它的宾语是前面的a few dollars。句意为：我们买票吧，尽管我们这只剩几美元了。while：尽管。
2. We shall ask for samples ___ and then we can make our decision.
A. to be sent B. being sent C. to sent D. to have been sent
【答案】A本句考查非谓语动词做宾语补足语，因为是将来式，所以用动词不定式做宾补，又因为宾语和宾语补足语之间是逻辑上的动宾关系，因此用动词不定式的被动。本句的意思是：“我们要求把产品的样品送来，然后我们可以做出决定。”
3. Some cities have passed laws that allow coal and oil ____ only if their sulfur content is low.
A. burning B. to burn C. being burned D. to be burned
【答案】D。本题考查的是allow sth. to be done，主动形式是allow sb to do sth.此处是允许人们在硫含量低的情况下燃烧煤和石油，所以它们是被燃烧，用被动。
4. Mother warned the electric lamp.
A. not to touch B. him not to touch C. him not touching D. him not touch
【答案】B不定式的否定式。warn sb.. not to do sth..属于固定搭配。意为“警告某人不要做某事”。
5. Don't leave the water ________ while you brush your teeth.
A. run B. running C. being run D. to run
【答案】B。别让水一直流着。
1. Having a trip abroad is certainly good for the old couple, but it remains _____whether they will enjoy it.
A. to see B. to be seen C. seeing D. seen
【答案】B。本题考查固定用法。It remains to be seen尚待分晓。对于这对老夫妇来说去国外旅游是好事情，但是还得看到底他们喜不喜欢。首先it(老夫妇去旅游这件事)还有待于观察，表将来用不定式。这件事情是被观察，因此选被动。综上选B。
2. The purpose of new technologies is to make life easier, _______ it more difficult.
A. not make B. not to make C. not making D. do not make
【答案】B。新技术的目的是让生活变得更容易，而不是变得更难。不定式作表语。
3. One can go a long way after one is _________.
A. tireB. tiring C. tired D. to be tired
【答案】C。一个人累了之后还能走很远。
4. The pilot asked all the passengers on board to remain ________ as the plane was making a landing.
A. seatB. seating C. seated D. to be seating
【答案】C 飞行员要求飞机起飞时，所有的乘客在座位上坐好。
5. He is _______ about why other lions are running away, until an old lion tells him that hunters are coming.
A. confused B. confusing C. being confused D. to be confused
【答案】A。他感到困惑confused 固定用法。
