Based on the agreement,all payments          be made by the end of the month.

may

can

shall

will

考查情态动词。句意：根据协议，所有款项应在月底付清。shall用于法律，条款中表示必须要做的事。故选C项。

The question of           English will keeping on changing in the future is easy         .

if; to answer

whether; to be answered

if; to be answered

whether; to answer

考查宾语从句和非谓语动词。句意：英语将来是否会继续变化这个问题很容易回答。第一空为宾语从句，从句中不缺少成分，表示“是否”，应用whether，if 引导的宾语从句不能充当介词的宾语，故排除A和C；第二空，这是be +性质形容词+不定式结构，这种结构中形容词说明不定式的特性，句子的主语是不定式的逻辑宾语。故选D项。

Lucy tried to help, but she was          as if she was  interfering, not helping.

dynamic

compulsory

scared

clumsy

考察形容词。句意：露西想要帮忙，但她笨手笨脚，好像在干涉别人，而不是在帮忙。A.dynamic动态的；B. compulsory 义务的；C.scared 害怕的；D.clumsy笨拙的。结合后文好像是在干涉别人，而不是在帮忙。可知露西笨手笨脚的。故选D项。

According to Professor Johnson, we don't have to read the book if we don't want to, as it is              .

worthwhile

necessary

optional

serious

考查形容词词义辨析。句意：根据约翰逊教授的说法，如果我们不想读这本书，就不必读，因为它是可选择的。A. worthwhile值得的； B. necessary 必要的；C. optional 可选择的；D. serious 严肃的，认真的。根据“  we don't have to read the book if we don't want to”可知，这本书读不读都可以，由此可知它是“可选择的”。故选C项。

People           about what our future will look like for thousands of years.

have been wondering

wonder

wondered

will wonder

考查动词时态。句意：数千年以来人们一直想知道我们未来是什么样子。根据时间状语 for thousands of years可知，描述从过去开始一直持续到现在的动作，用现在完成进行时。故选A项。

---Shall I tell Jhon about it?

---No, you            . I've told him already.

needn't

wouldn't

mustn't

shouldn't

考查情态动词。句意：---要我告诉约翰这件事情吗？--不，不必了，我已经告诉他了。A.needn't不必；B. wouldn't不会；C. musn't禁止，不允许；D. shouldn't 不应该。根据“I've told him already”，可知这里是“不必要”。故选A项。