1. The school principle told me that I could be in the football ___1____
team if I practised more.
2. The strange， almost incomprehensible fact is that many professors，
just like they feel obliged to write dully， believe that they sholud ___2___
lecture dully.
3. The unemployment rate in the US arose to 4.5% in April from 4.3% ___3___
in March due to its economic slowdown.
4. Using cells from immature animals makes it more difficult for
secientists to perdict with certainty the physical character of the ___4___
resultant clone.
5. We must not forget that advertising makes a positive contribution
to our products. Newsapaper， commercial radio and television
companies could not subsist without this resource of revenue. ___5___
6. The agricultural revolution in the nineteenth century involved two
things： the invention of labor-saving machinery and the developing of ___6___
science agriculture.
7. Many foreigners in England have considerate difficulty in making ___7___
themselves understood
8. Having lived in Guangzhou for years， some people still can‘t adopt ___8___
themselves to the hot and humid weather.
9. At Duke， economy is the most popular major， attracting nearly 15 ___9___
percent of undergrates.
10. The orangutan of Sumatrs and Borneo shares 96.4 percentage of ___10___
the same genetic make-up humans.
参考答案及解析：
1. principle -%26gt； principal
principle意为“原则，原理”，principal意为“校长”，根据句子的意思这里应该是“学校校长”。
2. like -%26gt； as
like： 像……一样。like后面不能接从句。
as： 介词（作为），副词（如此），关系代词，连词（因为；随着；虽然；正如）
3. arose -%26gt； rise
arise：没有“上升”之意，多指“产生，发生，出现”，是不及物动词；
rise：“上升、增长”，是不及物动词；
raise：是及物动词，表示把具体事物抬起到高处或提高某抽象事物（工资，地位等）。
4. character -%26gt； characteristic
character“性格，角色”，characteristic意为“特性，特征”。
5. resource -%26gt； source
resource意为“资源”，source意为“来源”，此处指税收来源，故使用后者。
6. developing -%26gt； development
这里应该使用develop的名词形式development，表示“科技农业的发展”。developing的意思是“发展中的…”。此处的development与invention是并列的。
7. considerate -%26gt； considerable
considerate意为“体贴的，周到的”，用法有be considerate of sb；
considerable意为“相当大的，相当多的”。根据意思应该用后者。
8. adopt -%26gt； adapt
adopt意为“采用，采纳；正是通过；收养”；
adapt意为“使适应；改编，改写”。
9. economy -%26gt； economics
economy：经济，经济制度；
economics：经济学；
economic：经济的，经济上的，经济学的；
economical：节约的，节省的，be economical of “节省……”。
10. percentage -%26gt； percent
percentage不直接跟在数词之后，常用于a percentage of sth /sb，如： Only a few vegetable-origin foods have such a high percentage og protein.而percent通常直接跟在数词之后表示百分比的数值。