4.在她的努力之下，她终于赶上了班上的同学。 With her efforts, she finally caught up with others.
5.她的梦想是成为偏远地区的一名志愿者，那里 的人们非常需要帮助。 Now, her dream is to become a volunteer in the remote areas, where people are in great need of help.
One possible version:
Lihua, whose mother is my English teacher, is my good friend. She is always ready to help others, which makes her popular among the whole class. There was a time when her study suffered because of her illness. Fortunately, with her efforts, she finally caught up with others. Now, her dream is to become a volunteer in the remote areas, where people are in great need of help.
四、语篇训练（定语从句在写作中的应用） 以下是你们班班长李华的相关信息： 李华是我的好朋友，她的妈妈是我的英语老师。李华 总是乐于助人，这使得她在班上很受欢迎。曾经有 一段时间，她因为生病学习受到影响。在她的努力 之下，她终于赶上了班上的同学。她的梦想是成为偏 远地区的一名志愿者，那里的人们非常需要帮助。 【写作要求】 注意定语从句的运用，注意上下英语老师。 Lihua, whose mother is my English teacher, is my good friend. Lihua is my good friend whose mother is my English teacher.
2.李华总是乐于助人，这使得她在班上很受欢迎。 She is always ready to help others, which makes her popular among the whole class. 3. 曾经有一段时间，她因为生病学习受到影响。 There was a time when her study suffered because of her illness.