1．(2013·哈尔滨一模)— David is often absent from cla ss.
— Tell him he ________ answer for it if he goes on behaving like that.
A. shall B. might
C. would D. can
答案与解析 A 句意：——David现在经常旷课。——告诉他，如果再这样，后果自负。情态动词shall用于第二、三人称的陈述句中，可表示警告、许诺、命令、威胁等语气。故答案选A。
2．(2013·济南一模)— Can you keep a secret?
— You ________ worry — I'm not going to mention it to anyone.
A . needn't B. couldn't
C. mustn't D. won't
答案与解析 A 句意：——你能帮我保守秘密吗？——你不必担心，我不会向任何人提及的。needn't“不必要”； couldn't“不能够”； mustn't“禁
