New Words：

contribution [.kɔntri'bju:ʃən] n. 贡献；捐款；捐赠
inexperience [.inik'spiəriəns] n.无经验；不熟练

Sample Sentences：

All contributions, however small, will be greatly appreciated.
He has made an important contribution to the company's success.
We laughed at her inexperience in the kitchen; she couldn't boil water.

New Words：

contribute [kən'tribju:t] v. 捐助；捐献；贡献；撰稿；是…的原因之一

Sample Sentences：

Each worker contributed one dollar to the Red Cross.
She contributed a number of articles to the magazine.
It was generous of her to contribute such a large sum.
We contributed a sum of money to the homeless survivors of the earthquake.

generous ['dʒenərəs] adj. 慷慨的, 宽宏大量的, 丰厚的, 丰盛的
survivor [sərˈvaɪvər] n. 幸存者；生还者

New Words：

lung [lʌŋ] n. 肺
cancer ['kænsə] n. 癌；肿瘤；毒瘤

Sample Sentences：

The cancer has spread to his stomach.
Does smoking contribute to lung cancer?
Is there a connection between smoking and lung cancer?

contribution [.kɔntri'bju:ʃən] n. 贡献；捐款；捐赠
connection [kə'nekʃən] n. 连接；关联；联结；接通

New Words：

due [dju:] adj. 由于；因为；到期；应有；应得的

Sample Sentences：

The next train is due in five minutes.
His success is entirely due to hard work.
That money is due to me, but I haven't got it yet.
Have they been paid the money that is due to them?

New Words：

youth [ju:θ] n. 青春；年轻；年轻人；小伙子

Sample Sentences：

His mistake was due to youth and inexperience.
There was a group of youths standing on the street corner.
The youth of today has greater opportunities than ever before.

due [dju:] adj. 由于；因为