【三维设计】2013高中英语 Unit21 Human Biology Section Ⅳ 专题练习课下作业 北师大版选修7

Ⅰ.用适当的情态动词填空

1．Tom comes from Australia and he can speak English very well.

2．I heard you bought a new book. May I have a look?

3．If you can pass the driving test, you shall get a new car.

4．It is sunny today; we needn't take an umbrella.

5．Would you like to have a dinner with me?

6．—Must we finish the composition in class?

—No, you needn't/don't_have_to.

7．You needn't read that book if you don't want to.

8．—Must/Need I water the trees on Tuesday?

—No, you needn't.

9．He is so strong that I dare_not fight against him.

10．We ought_to have received the letter yesterday, but it didn't arrive.

Ⅱ.完成句子

1．菲利普可能已经在交通事故中严重受伤了。

Philip may_(might)_have_been_hurt seriously in the car accident.

2．她不需要上场了，因为比赛被取消了。

She didn't_need_to_play because the match was cancelled.

3．他本没必要带食物来聚会的，因为足够了。

He needn't_have_brought any food to the party because there was plenty already.

4．汤姆一定已经吃了蛋糕了，因为他的嘴上有些蛋糕。

Tom must_have_eaten the cake, for there is some on his mouth.

5．如果你跟着他学，你本可以向他学到更多东西的。

You might_have_learned more from him, if you had followed him.

Ⅲ.单项填空

1．Although this ________ sound like a simple task, great care is needed.

A．must　　　　　　　　　B．may

C．shall D．should

解析：选B。句意：尽管这听起来像是很简单的任务，但细心还是必要的。may表推测“可能”。

2．There is no light on － they ________ be at home.

A．mustn't B．can't

C．needn't D．shouldn't

解析：选B。句意：灯不亮——他们不可能在家。can用于否定句或疑问句中，表推测“(不)可能”，must表推测时，不用于疑问句或否定句中。

3．—Who ________ it be that is knocking at the door?

—It ________ be father, but I'm not sure.

A．can; must B．must; can

C．can; may D．may; must

解析：选C。第一个空can用于疑问句中表推测；第二个空受I'm not sure限制，只能用may表推测“可能”；must表推测“一定”。

4．She was a good swimmer, so she ________ swim to the river bank when the boat sank.

A．could B．might

C．shall D．was able to

解析：选D。句意：她游泳游得很好，所以小船下沉的时候她能游到河岸。could和was able to都表能力，但could表示一般的能力，表示过去有能力并干成了某事只用was/were able to。

5．Why ________ we eat outside ________ we have so much delicious food at home?

A．must; when B．can; while

C．will; as D．should; though

解析：选A。句意：既然我们家里有这么多好吃的东西，干嘛偏要出去吃呢？must表示“偏要，偏偏”；when在这里是“既然”的意思。

6．He did not regret saying what he did but felt that he ________ it differently.

A．could express B．would express

C．could have expressed D．must have expressed

解析：选C。考查情态动词。句意：他并不遗憾说了他做的事，而是感觉他本来能用不同的方式表达。could have done sth.意为“本来能够做某事，其实没做”，符合语境，故选C。

7．The little girl ________ go downstairs alone when her parents were out.

A．didn't dare to B．dared not

C．dare not to D．dare not

解析：选B。考查情态动词。句意：当她的父母不在家时，这个小女孩不敢单独到楼下。dare作情态动词时后面要跟动词原形，排除C；而D时态不对，排除D；而A项中dare用作实义动词，后面应用动词原形。

8．If you had spoken to him last time you saw him, you ________ what to do now.

A．would have known B．should have known

C．would know D．may know

解析：选C。考查虚拟语气。句意：如果上次你见他时跟他说话，现在你就知道做什么了。根据语境可知主句是对现在情况的一种虚拟，要用would＋动词原形，故选C。

9．—What do you think we can do for our aged parents?

— You ________ do anything except to be with them and be yourself.

A．mustn't B．oughtn't to

C．don't have to D．can't

解析：选C。考查情态动词。句意：“你认为我们能为我们年老的父母做些什么”“除了陪他们并且自己好好的，你没有必要做任何事”。don't have to do“没有必要做某事”，符合语境，故选C。

10．You ________ further into this matter. If so, you ________ know who did it now.

A．must have enquired; will

B．should have enquired; would

C．could have enquired; will

D．shouldn't have enquired; would

解析：选B。考查情态动词与虚拟语气。句意：你应该深入调查此事。如果这样，你现在就知道是谁干的了。第一个空考查should have done“本应该做某事，其实没做”；第二个空考查虚拟语气，是对现在情况的一种虚拟，故用“情态动词＋do”，故选B。