1. (2020高二上·漠河期末) 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（∧），并在此符号下面写出该加的词。

修改：在错的词下面划一横线，并在横线下面写出修改后的词。

注意：每处错误及其修改仅限一词。

1. （1） Unless you help us, or we won't be able to succeed.
3. （2） Look around when crosses the street.
5. （3） Three-fifths of his pay were spent on food and clothing.
7. （4） Her hair is longer than you.
9. （5） He would rather stay at home than to go out with you.
11. （6） Be careful and you'll fall into the river.
13. （7） Although I know that I have to study quite a number of subjects to become a learned person, but there are two subjects to which I pay special attention.
15. （8） There stands two factories on the river.
17. （9） This is the house where we visited last time.
19. （10） Don't do any more work now, you look so tiring.