Let us not waste ______ time we have left .
______to the sun for too long, I think, can hurt your skin.
—We were surprised to hear that the reason_______ she gave for her absence was______ her mother was ill.—Yes,we saw her mother was at the supermarket that morning.
—I wonder what makes you a successful manager.—I ________ as a waiter for five years,which contributes a lot to my today’s work.
Due to the widespread ________ of this medical technology,more diseases can be discovered and treated at an early stage.
The book was written ______ careful observations and detailed studies.