66．studies　谓语动词为show，故空格处应填study的复数形式studies。

　　67．regularly　空格处修饰动词短语“take short breaks”，故用副词。regular的副词形式是regularly。

　　68．a　for a while“片刻，一会儿”，是固定搭配。

　　69．to bring　be likely to do sth.“可能做某事”。句意：如果你发现在办公室之外有喜欢做的事情，你把工作带回家的可能性就小了。

　　70．make　分析破折号后的句子结构可知，whatever引导让步状语从句，make sure ...部分是主句。这里用动词原形开头构成祈使句。

　　C(2016·全国卷Ⅲ)

　　In much of Asia, especially the so­called “rice bowl” cultures of China, Japan, Korea, __61__ Vietnam, food is usually eaten with chopsticks.

　　Chopsticks are usually two long, thin pieces of wood or bamboo. They can also be made of plastic, animal bone or metal. Sometimes chopsticks are quite artistic. Truly elegant chopsticks might __62__ (make) of gold and silver with Chinese characters. Skilled workers also combine various hardwoods and metal __63__ (create) special designs.

　　The Chinese have used chopsticks for five thousand years. People probably cooked their food in large pots, __64__ (use) twigs (树枝) to remove it. Over time, __65__ the population grew, people began cutting food into small pieces so it would cook more quickly. Food in small pieces could be eaten easily with twigs which __66__ (gradual) turned into chopsticks.

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