根据句意及汉语提示，写出所缺单词。
【小题1】You have __________(通过) all the exams. Congratulations!
【小题2】There is no safe landing on that __________(海岸).
【小题3】It’s a great __________(乐事) to help others.
【小题4】I think it’s __________(必要的) for me to buy a new dictionary.
【小题5】Young people like to chat with their __________(在线的) friends.