—He_______to the meeting. Have you informed him of it? —Sorry. I _______to.

Gary Locke , a Chinese-American, once______ as the governor of Washington for 8 years and now is U.S. Commerce Secretary．

After the examination，my teacher told me that failure _______the mother of success.

 Every few years, the coal workers                 their lungs X-rayed to ensure their health.

While intelligent people can often ______ the complex, a fool is more likely to make the simple more difficult.