单项选择题
Students will find the book __________ as it offers an abundance of information on the subjects.
单项选择题 Travel can be an excellent __________ to one's education.
单项选择题 He gave me a definite__________ that the publication of that environment report would cause a stir among the local inhabitants.
单项选择题 We have a firm belief in our ability to overcome the obstacles which__________ us.
