【小题1】My brother has been in the army (军队) for half a year.
【小题2】Riding a bike will save energy and reduce (减少) air pollution.
【小题3】 ---What are you doing?
---I'm considering/ thinking about (考虑) changing my job.
【小题4】---Are you free, Maria? I'd like to talk with you. It won't take up (占据) too much time.
---No problem.
【小题5】 I have paid for (为……付款) the shirt. Let's go home.
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解析：
【小题1】根据汉语提示，可知所需单词为army，结合上下文可知不须词形变化。
【小题2】根据汉语可知所需单词为reduce，结合前文助动词will可知改动词用原形。
【小题3】根据汉语可知所需单词为consider或者短语think about，结合上文时态及前文助动词am，可知动词需变为进行时态。
【小题4】结合汉语可知所需单词为词组take up，结合前文助动词，可知动词用原形。
【小题5】结合汉语可知所需为短语pay for，联系前文助动词可知句子时态为完成时态，故pay变为过去分词。