单项选择题
The（）of blood always makes me feel sick.
A.signB.sightC.sceneD.look
单项选择题 Mrs Black doesn’t believe her son is able to design camera．（）？
单项选择题 At the conference，people of different（）were given a chance to exchange theirs with each other.
单项选择题 It was foolish of him to（）his notes during that important test, and as a result, he got punished.
