What does Mr. Pitt NOT do in his spare time

单项选择题According to the passage, birds often half sleep because______.

单项选择题All of the following qualities EXCEPT _______have been mentioned by President Bush as qualities that a nominee should possess.

单项选择题The new trend in artificial intelligence research stems from

单项选择题The London blasts began at ______.

单项选择题The police searched ______homes in attempt to find attack-related explosives and computer files.