Once there was a boy who was very poor and could not afford（1） ______ （buy） books，so he often went to a library nearby to read books．One day，it was already dark （2） ______ he realized it but he hadn't finished his book yet．（3） ______ （consider） he must return it at once，he let（4） ______ a cry in the dark．The （5） ______ （library） was such a kind woman that she told him it was（6） ______ （appropriate） but he could help her in the day（7） ______ exchange for reading for free at night．Hearing this，the boy felt a heavy load （8） ______ （take） off his mind．He nodded heavily and gave her a big smile．From then on，he read a load of books and got a （9） ______ （scholar） at school and even won the championship in a reading（10） ______ （compete）．What an encouraging story it is!We should all learn from him．