单项选择题
—What did the children do in school—Their teacher ______ a short talk about their holiday.
单项选择题 —We didn't see him at the lecture yesterday.—He ______ it.
单项选择题 He's working hard for fear that he ______.
单项选择题 George entered the box and picked up one of the directories inside, ______ that someone unknown had torn out the very page he needed
