单项选择题
Only after half a year ______ to find the result of my experiment in his lab.
单项选择题 People are coming to understand that easy access to ______ is often the key to success in this highly developed society.
单项选择题 It's better to avoid ______ downtown during the rush hour.
单项选择题 When my son was a child, he ______ ice cream, but he doesn't like it now.
