在英语写作中，句首的单词需要首字母大写。

In English writing, you should start by ___capitalizing the first word of a sentence.

这家初创企业正在利用社交媒体热潮来推广他们的新产品。

The startup is ___capitalizing on the social media trend to promote their new product.

这家新公司由几位投资者共同出资成立。

The new company was ___capitalized by a group of investors.