Is it the book that ________ people of allages ______ became the best-seller last year

.—Have you found your MP4 yet? —Yes. It was in the classroom, rather than on the playground, ________we practiced dancing.

It is generally believed that teaching is ________ it is a science.

I want to employ a college student who is good at English and math and has lots of spare time to teach my son. __________, he or she must have a sense of responsibility.

下面文学常识表述完全正确的一项是（ ）