单项选择题
Government cannot operate effectively（）it is free from such interference.
A. so long as B. so that C. unless D. because
单项选择题 What did the man mean（）
单项选择题 What is the most probable relationship between the two speakers（）
填空题 What do the Garden’s Guides do every day at 11 am and 2pro They show the tourists ______ the Gardens.
