—What are you doing?
—I'm looking _____ the kids. They should be back for dinner now.
我们可用“逻辑推理法”解答本题。look after “照顾”； look at “看……”； look for “寻找”； look up “查阅；向上看”。由答语后句句意 “现在他们该回来吃晚饭了” 可推知，答话人正在找孩子。故答案为C选项。
—Another person was hurt by the tiger in the zoo.
—What a pity! That is a lesson to us: we must take rules _____.
考查副词辨析。
考查副词辨析。句意：—又一个人在动物园里被老虎伤害了。—太遗憾了！对我们来说这是一个教训：我们必须认真对待规则。take… seriously 是固定搭配，意为 “认真对待……”。故选选项D。
—Shall we go to see the documentaryAmazing Chinaor stay at home?
—Either is OK. _____.
考查交际用语。
Go ahead意为 “进行”，表示鼓励对方去做；It's up to you意为 “由你决定”；That's all right意为 “不用谢”。根据Either is OK. 可知，应该是 “由你决定”。
Everyone knows that China is getting _____.
形容词比较级的结构。
考查形容词比较等级。句意：每个人都知道中国正变得越来越强大。比较级+and+比较级，意为“越来越……”，故选选项3-。