动词形式是exclaim,中文意思是v. 呼喊,惊叫,大声说

Parts of the route driven by the bus driver have been blocked by recent snowfalls, and some passengers started to gasp and exclaim.

巴士司机驾驶的路线中有部分路段被近期的降雪堵塞了,有些游客们开始紧张地喘息和惊叫。