1. I am considering ___my job as I’m not getting on well with my boss.

　　A. changing B. to change C. changed D. to be changed

　　【答案】A consider后边接动名词做宾语，表“思考做某事”;consider sb./sth. to do表“以为”。因而A为准确答案。本句的意思是：“我正在思考换作业，由于我和老板联系不太好。”如：We are considering learning a foreign language.咱们正在思考学一门外语。

　　2. Charles Babbage is generally considered ______ the first computers.

　　A. to invent B. inventing C. to have invented D. having invented

　　【答案】C此题考察的对错谓语动词中不定式的用法。Be considered/said/ believed to do 表明：据以为/听说/据信任做……，然后边的动作若现已发作，则用完结时表明，故选to have invented.

　　3. Mary regretted ___ to John’s birthday party last Sunday.

　　A. not going B. not to go C. not having been going D. not to be going

　　【答案】A。regret后边要跟动名词做宾语，动名词的否定式是在动名词之前直接加not。

　　4. I regret _______ you that we are unable to offer you a job.

　　A. in forming B. having informed C. to inform D. to informing

　　【答案】C。regret to do sth.惋惜做某事。我很惋惜的通知你咱们不能给你这份作业。

　　5. In some parts of London, missing a bus means _______ for another hour.

　　A. waiting B. to wait C. wait D. to be waiting

　　【答案】A。means doing意味着。在伦敦的某些当地，错失汽车意味着再等一个小时。