单选题 Her _________ for learning English is to broaden her horizon.

单选题 The poll's results were based on telephone interviews conducted Oct 1-19, with a _____ sample of 823 adults in all 50 states and Washington DC.

单选题 Rex does not _________ be willing to help the girl.

单选题 A combination of internal and external ___________ caused the company to close down.

单选题 He failed to supply the facts relevant _____ the case in question.

单选题 Anyone who has spent time with children is aware of the difference in the ways boys and girls respond to _________ situations.

单选题 _________________ must a soldier leave his post.

单选题 He was one of the most creative and ________ engineers of his generation.