SAT语法题：Horse psy chology,a science that investigates the rea

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SAT语法题：Horse psy chology,a science that investigates the reasons for the behavior of horses,(help) trainers both motivate their charges and prevent problems.短划线,括号里的是错误的,为什么?找不出原因…
Ms.Kovak proudly displayed her research group's most ingenious invention,a vacuum cleaner thar empties its own dust bag when (pressing a button).括号里是错误的,是不是应该把pressing改成press?
Both her work on community service projects and her dedication to learning (has gained) Ms.Stevens the respect of the entire faculty.括号里是错误的,但是句子中没有找到任何有关时态的词,而且前面learning是划线部分,不敢确定…求解吖!

1. help 应该是三单式 helps,因为主语是抽象名词,即一门学科 horse psychology.

2. pressing a button 应该是 you press a button,因为pressing是主动式,但主语a vacuum cleaner不能发出这个动作.

3. has gained 宜改为 have gained.

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