They lived a hard life and were often made _______ for over ten hours a day.
— Mike, what did our monitor say just now? —Every student as well as teachers who are to visit the museum _____ asked to be at the school gate before 6:30 in the morning.
Studies show that people are more _____ to suffer from back problems if they always sit before computer screens for long hours.
The next morning he woke up to find himself _________ with a coat.
She would lend me the money if I promised to ________ within a month.
Water, _____ we cannot live, exists in the form of liquid, gas or solid.