—Mum, can I watch the TV program for another twenty minutes?—Sorry, dear, it's time you ________ to bed.
I can’t thank you ______ much because without your help I ______ have won the first prize.
The big city has always been the dream career destination of college students. But of late a trend of heading back home ________a part of future job considerations.
A severe drought over the past months has left 7.5 million people without ________ drinking water in two southwestern Chinese provinces.
Stronger and more lasting memories are likely to be formed ________a person is relaxed.
British scientists said teenagers are programmed to take risks because they enjoy the thrill of dangerous situations________ others.