_____ the secret of nature, the young scientist has little time for entertainment.
______ is known to all, the earth travels round the sun once every year.
Many people in China are ________ a “Hope Project”, helping poor children to get compulsory education.
But for the storm, we __________ a pleasant journey, but had to turn back halfway.
I ________ up early this morning, so I stayed in bed until 8 o’clock a.m.
— What’s the matter with Peter? — He was seen crying when he was coming out of the office.He ________ by the manager.