根据短文内容，选择方框内的单词, 并用其适当的形式填入空白处，使短文意思连贯通顺，语法正确。

Duties of a Student

    Education is the very thing that we want to receive. Our parents ____ us to school so as to enable (使能够) us to get knowledge and achieve great things in the future. The followings are the duties of a student which we should keep in ____.

    Firstly, we should be filial (孝顺的) to our parents and respectful to our ____.

    Secondly, we must study as ____ as we can.

    Thirdly, we must not tell lies.

    Last of all, we must not criticize (苛求) ____.

    To sum up, the above-mentioned rules are the very duties of a student.

下列四组词语中只有一组有错别字，把它选出来（   ）。

每年夏收和秋冬之际，总有大量的小麦、玉米等秸秆在田间焚烧，产生了大量浓重的烟雾，成为殃及环境的罪魁祸首。近年来，通过科技进步与创新，为农作物秸秆的综合开发利用找到了多种用途，除传统的将秸秆粉碎还田作有机肥料外，还走出了秸秆饲料、秸秆汽化、秸秆发电、秸秆乙醇、秸秆建材等新路子，大大提高了秸秆的利用值和利用率，由“污染物”变成“经济作物”的哲学依据是（    ）