However, as students, we should not look for answers to copy when studying, which is not good for us. We should learn to do our homework first. We should think about our homework by ourselves. If it really doesn't work, you can ask your teachers, classmates and parents. If they can't, we can only watch it with the consent of teachers and parents. Sometimes after finishing our homework, we can compare our answers to see if we have done it right, and we have done several questions right. Only in this way can we improve our ability.