强化练习
1. Peter was so excited when he received an invitation from his
friend             Chongqing.
to visit
【解析】句意：当彼特的朋友邀请他参观重庆时，他是如此激动。动词不定式to visit限定invitation做后置定语。故填to visit。
2. He gave a lame excuse for       (absent) which made him very embarrassed.
being absent
【解析】句意：他了个站不住脚的理由来解释缺席的原因，这使他很尴尬。be absent表示缺席，且作介词for的宾语，应用动名词短语being absent，故填being absent。
3. Helen was kinder to her youngest son, which made the others       (envy) him.
envy
【解析】句意：海伦对她的最小的儿子比对其他的孩子要好得多，这使其他的人很是嫉妒。make sb.do sth.表示让某人做某事，使役动词make后跟省略不定式符号to的不定式，作宾语补足语。故填envy。
4. I like getting up very early in the morning because the morning air is so good       (breathe).
to breathe
【解析】句意：我喜欢早起，因为早晨可以呼吸到新鲜空气。breathe和air之间虽然是动宾关系，但good后省略了for me，其逻辑主语是I，故用动词不定式的主动形式。故填to breathe。
5. We had better put off interviewing the athlete, for he is busy preparing for an international contest _______ (hold) in Shanghai next month.
object to
to be held
【解析】句意：我们最好推迟采访这位运动员，因为他正忙于准备下个月在上海举行的国际比赛。此处contest和hold之间是一种被动关系，这里是动词不定式一般式的被动式作后置定语，故填to be held。
6 Everyone in our class was working hard and doing what we could ______ (enter) a good college.
to enter
【解析】此句为省略句，即在could后省略了动词do，若把句子补完整应为Everyone in our class was working hard and doing what we could do to enter a good college。即句中的不定式短语（to enter a good college）是用作目的状语的，而不是与情态动词could一起构成谓语。故填to enter。
6. You don't have to run fast or for long________ (see) the benefit.
to see　
【解析】句意：你不必跑很快或很久就能看到它的好处。分析句子结构可知，此处应该使用不定式形式作目的状语。
8. The government encourages farmers to grow corn instead of rice ______ (improve) water quality.
to improve
【解析】根据“改善水质”是“政府鼓励农民种植玉米而不种植水稻”的目的，可知此处应用动词不定式作目的状语。
9. Once his message was delivered, he allowed me ________ (stay) and watch.
to stay
【解析】 do sth.为固定搭配，意为“允许某人做某事”。
10. While regularly eating out seems to________ (become) common for many young people in recent years, it's not without a cost.
have become
【解析】根据后面的时间状语in recent years可知，此处应该用动词不定式的完成时。
11. They are required ________ (process) the food that we eat, to recover from injury and for several other bodily functions.
12. For 25 days, she never left her baby, not even to find something ________ (eat)!
13. When a new day breaks, the walls have given up their heat and are now cold enough ________ (cool) the house during the hot day; at the same time, they warm up again for the night.
14. I heard a passenger behind me shouting to the driver, but he refused ________ (stop) until we reached the next stop.
15. You may drink, smoke, be overweight and still reduce your risk of ________ (die) early by running.
16. I quickly lower myself, ducking my head to avoid ________ (look) directly into his eyes so he doesn't feel challenged.
17. I still remember ________ (visit) a friend who'd lived here for five years and I was shocked when I learnt she hadn't cooked once in all that time.
18. Fast food is full of fat and salt; by ________ (eat) more fast food people will get more salt and fat than they need in their diet.
19.But unlike her school friends, 16­year­old Sarah is not spending half­term ________ (rest)．
20. The next morning he hired a boat and set out       (find) the well-known painter.
21. The Romany resist ____________ (make) permanent homes, and choose not to become citizens of the countries they move to.
22. Many students objected to _____ (arrange) for extra lessons during holidays.
23. My ambassadorial duties will include ________(introduce)British visitors to the 120­plus pandas at Chengdu and others at a research centre in the misty mountains of Bifengxia.

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