单项选择题
Private employment agencies may not have your best interest（）heart.
A.by B.at C.from D.in
单项选择题 He has been（）from the swimming race because he did not win any of the practice races.
单项选择题 We（）to deliver the goods within a week.
单项选择题 Barter had been so humiliated that he felt himself to be（）to every educated man he met.
