单项选择题
The cost of self-education has fallen with the multitude of sources of knowledge and information（）on CD-ROMs and the Internet.
A．preferable B．ready C．available D．considerable
单项选择题 The company owns a large number of（）stores.
单项选择题 Six years（）before she got another note from Teddy.
单项选择题 When pessimists（）in their first attempt, they usually say, "I can't do this."
