单项选择题
Since William had been seriously ill for several months, his parents were worried about（）to return to school full-time.
A.he wanted B.he wanting C.him to want D.his wanting
单项选择题 It（）as a shock to realize that I was not alone in the room.
单项选择题 （）so many people in the United States been out of work as today.
单项选择题 When he suddenly（） up the subject of genetic engineering, there was an embarrassed silence.
