9 . 请你修改以下的每个句子，每句有1处语言错误，错误涉及一个单词的增加或修改。
增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。
删除：把多余的词用斜线（╲）划掉。
修改：在错的词下划一横线，并在该词下面写出修改后的词；
注意：每处错误及其修改均仅限一词。每题仅有一处错误。
1. Mark is a genius. By the time he graduated, he had offered jobs by a couple of computer companies.
2. Emojis, dated back to the 1990’s, are small symbols representing ideas, emotions or feelings.
3. Phone boxes are hard to find, and the main reason for this is simply because we don’t need them any more.
4. To make advertisements attractive, huge amounts of money is spent in applying modern design techniques.
5. Henry was happy to withdraw from social life, seeking a harmony relationship with nature in his quiet life.
6. They are putting innocent lives in risk by starting boundary conflicts.
7. I find this impossible to cooperate with him for mutual benefits.
8. There is an urgent need for people in developing countries to have an access to drinking water.
9. The tourist industry is vital importance to the national economy.
10. The author provided some supporting arguments to make the point convinced.