vocabulary.

　　A．acknowledges B．conveys

　　C．declares D．assesses

　　解析：选B　acknowledge "承认，答谢"；convey "传达，运送"；declare "宣布"；assess "评定，评估"。由语境可知B项正确。

　　6．Obviously, we can draw the conclusion that good manners ________ from politeness and respect for others.

　　A．happen B．arise

　　C．appear D．rise

　　解析：选B　句意：显然，我们可以得出结论，良好的举止源于礼貌和对他人的尊重。arise from "起因于"，符合题意。happen "发生"；appear "出现"；rise "上升"。

　　7．As we are very busy these days, we might ________ this urgent work for the time being.

　　A．undertake B．acknowledge

　　C．undergo D．oppose

　　解析：选A　句意：因为这些天我们很忙，我们可能暂时做这份急需做的工作。undertake "从事；进行"，符合句意。acknowledge "承认"；undergo "经历，遭受"；oppose "反对"。

　　8．Although his wife was killed in the earthquake, he ________ his sobs to rescue others.

　　A．showed off B．contributed to

　　C．accounted for D．choked back

　　解析：选D　句意：尽管他的妻子在地震中死了，但他还是抑制住哭泣去营救他人。choke back "控制住，忍住"，符合题意。show off "炫耀"；contribute to "有助于"；account for "说明......的原因"。

　　9. He decided to postpone ________ the house because his mother was ill, which cost him a lot of money.

　　A．to buy B．buying

　　C．to be buying D．being bought

　　解析：选B　句意：他决定推迟购房，因为妈妈他生病了，需要花很多钱。postpone 后接动名词作宾语，故选B。

10．Our computers are ________ to the world wide Internet, which provides