填入下面文段空白处的词语，最恰当的一组是（ ）有的人在填报高考志愿时选报热门专业，理由是能学以致用，① 是一种误解。学以致用的真正含义是将学到的知识用于实践，② 不是看什么东西有用才决定去学。屏弃功利性 ③ 使人抱着乐观的态度去学习； ④ 有用才去学习会使人产生心理负担，⑤ 总要担心以后会不会真的有用。抱着功利之心去挑选专业，往往会牺牲自己真正的兴趣，⑥ 毕业后谋到了不错的职位，也不一定就工作得很开心。 ① ②③④⑤⑥

How long does it take you to finish your homework every day—I usually ________ two hours on it.

is unpleasant, ________ when you aretrying to sleep.

Many countries are now setting up national parksanimals and plants can be protected.

I was really too busy with my homework and I couldn’t help ____________ housework