Study habits can help you throughout your education. As a successful student, you should _________.
①ask your classmate for help as soon as you find a problem.
②pay attention to WHY but not the ANSWER during your study.
③review your notes before beginning your homework.
④make a plan for studying
⑤try to study too much at one time
A. ②③④               B. ③④⑤            C. ①②④