1899.in(介)在……之中
It's two o'clock. I'll come in an hour.
現在是兩點鐘，我一小時后來。

1900.inability(名)無能力
Her inability to pay the rents caused trouble.
她無力付房租引起了麻煩。

1901.inch(名)英寸、身高
His legs are too long for has inches.
就他的身高而言，他的腿太長了。

1902.incident(名)事件；插曲
Were there any exciting incidents during your journey?
你在旅行中有沒有發生什么事？

1903.income(名)收入
Half of our income goes on rent.
我們收入的一半都花在租金上面了。

1904.incorrect(形)不正確的
反義詞correct
I beg to point out that your facts are incorrect.
恕我指出你所講的情況不真確。

1905.increase(名)(動)增加
(名):Crimes are on the increase.
犯罪活動不斷地增加。
(動):Travel increases one's knowledge of the world.
旅游增進人對份世界的了解。

1906.indeed(副)的確
These problems are indeed difficult ones, but I am sure they can be solved.
這些問題固然是有些困難，但我相信他們能夠解決。

1907.indefinite(形)不確定的
He gave me an indefinite answer.
他給我一個含糊其辭的答復。

1908.indirect(形)間接的；曲折的
We went to the house by an indirect road.
我們經過一條曲折的路到了這座房子。

1909.indirectly(副)間接的
I know Linda was only indirectly concerned in what took place.
我知道所發生的事情間接涉及到琳達。

1910.indoor(形)室內的
反義詞outdoor
Indoor pools are usually cleaner than outdoor pools.
室內游泳池比室外游泳池要干凈些。

1911.indoors(副)在室內
Don't stay indoors since the weather is so fine.
天氣這么好，就不要待在室內了。

1912.infamous(形)可恥的、不名譽的
As you dive over this ledge, watch for the infamous Crown of Thorns Sea Star.
當你潛到此處時,要小心臭名昭彰的長刺海星。

1913.influence(名)影響力(動)影響
(名):Listening to music has a calming influence on her.
聽音樂對她有一種安心定神的作用。
(動):I don't want to influence you. You must decide for yourself.
我不想影響你，你必須自行決定。

1914.inner(形)內部的、內在的
反義詞outer
Good books can enrich man's inner life.
好書可以豐富人的精神世界。

1915.insect(名)昆蟲
Insects propagate themselves by means of eggs.
昆蟲以產卵繁殖后代。

1916.insecure(形)不安全的
A shortage of military police made the air base insecure.
缺乏武警苦使得空軍基地不安全。

1917.inside(介)在……里面(形)內部的
反義詞outside
(介):He parked his car inside the gate.
他把車停在大門里面。
(形);He put his socks on inside out.
他把襪子穿反了。

1918.insider(名)內行人
An insider is the one who is in the secret.
內行人就是熟知內幕者。

1919.instead(副)代替、反而
If there is no coal, oil can be used instead.
如果沒有煤，可以用石油來代替。

1920.intellect(名)智力、理解力
同義詞brain
His opinion is that the intellect of modern man isn't superior.
他認為現代人的智力并不高超。

1921.intelligence(名)智慧；情報
He had the intelligence to put the fire out with a fire extinguisher.
他機靈地用滅火器滅火。

1922.intelligent(形)聰明的
The child made a very intelligent comment.
那孩子做了很有見地的評論。

1923.intend(動)打算
We intend this news report as teaching material for freshmen.
我們打算把這篇新聞報導作為新生教材。

1924.intent(名)意義(形)專心的
(名):The revised edition is to all intents and purposes a new dock.
修訂本實際上是一本新書。
(形):I am intent on my work.
我專心于我的工作上。

1925.intention(名)企圖、目的
He had made it clear that he had no intentions towards her.
他已表明自己沒有向她求婚的意圖。

1926.interact(動)互動
He should interact more with his colleagues.
他應該和同事有更多的交流。

1927.interest(動)使感興趣(名)興趣；利益
(動):Chemistry interests him.
他對化學感興趣。
(名):I have lost my interest in English.
我對英文已不感興趣。

1928.interesting(形)有趣的
Some of the most interesting names came from American Indian languages.
有些最有趣的名字來自美國印第安人的語言。

1929.Internet(名)網絡
After you passed the internet test, what happened?
你通過了網上測試以后呢？

1930.interview(動)(名)面試、面談；會見
(動):Alice has interviewed most of the applicants for the job.
愛麗絲已和大部分申請這份工作的人面談過了。
(名):Don't be late for your interview.
面試不要遲到了。