1. A rocket burns propellant rapidly and most rockets carry a supply that last (lasts) just a few seconds.(1)____

译文：火箭迅速燃烧推进剂，而大多数的火箭携带的补充物仅能维持几秒而已。

1．分析：last→lasts。考查主谓数的一致。定语从句中，若关系代词在从句中作主语，则从句谓语的数应与先行词一致。本题中，先行词a supply为单数，故last也应用单数形式lasts

2. Industrial buyers are responsible for supplying the goods and services that an organization required (requires) for its operations.(2)____

译文：工业买主负责提供企业运作所需的货物和服务。

2．分析：required→requires。考查时态。由are可看出本句的基本时态是现在时，讲述的是一般性的事实。故此处不宜用过去时，由于主语an organization是单数形式，应将required改为requires。

3. Although it is any (no) longer the big business that it was in the forties, radio continues to be a medium of essential communication, especially at the local level.(3)____

译文：尽管无线电通信行业不再如四十年代那样兴盛，但它仍然是基本通讯的媒介，尤其在地方通讯中。

3．分析：any→no。考查no和any的用法。no longer是固定说法，用在肯定句中，表示“不再”。any longer则用在否定句和疑问句中。Although后接的是肯定的it is，故此处用no longer。

4. The expansion of adult training programs has resulted partially from the feminist movement, which encouraging (encourages) women to improve their skills for the job market.(4)____

译文：成人培训课程扩展的部分原因是女权运动，女权运动鼓励女性去提高她们适应就业市场的技能。

4．分析：encouraging→encourages。考查谓语动词。which是从句主语，指代the feminist movement，其后接单数的谓语动词，encouraging不能单独作谓语，应改为encourages。