The big hospital, which___in 1936, has saved many lives.
People who often stay up too late are more likely to die of heart disease,________ a study.
He picked up an envelope________50 dollars in it.
I didn’t hear the phone. I ________ asleep.
—Does he know how to work out the problem?—Yes,he has ________ a good idea to solve it.
The trip will take about five months;it will be a long time ________ we meet them again.