单项选择题
A. She rarely contacts with her children. B. Her children have already worked. C. She has two daughters and one son. D. Her children have been living out of the UK.
A. The l7th. B. The l8th. C. The 19th. D. The 20th.
A. They are very rare. B. They often cause loss of life. C. They always occur in big cities. D. They arouse the interest of all the readers.