723.He got well-prepared for the job interview,for he couldn't risk ______ the good opportunity.
A.to lose
B.losing
C.to be lost
D.being lost
724._________ the meeting himself gave them a great deal of encouragement.
A.The president will attend
B.The president to attend
C.The president attended
D.The president's attending
723.答案是B;risk doing sth.冒险做某事，为常用搭配。
724.答案是D;此题考查动名词复合结构作主语，即，名词所有格或形容词性物主代词+动名词。
