1.	I must work to improve my English.
	我必须努力提高英语水平。
2.	The department was revamped to try to improve its performance.
	该部门进行了改组以改进工 作。
3.	His language was uncompromising: he told them their work must improve or they would be fired.
	他的话说一不二。
4.	How can we improve our (public) image?
	我们怎样才能改善自己(在公众心目中)的形象？
5.	The Post Office aims to improve its quality of service.
	邮局锐意改善服务质量。
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improve on...   改进， 改善
improve upon...   改进， 改善