The traditional view is _____ we sleep because our brain is “programmed” to make us do so.
He was _______of selling state secrets and arrested last month.
After graduating from a university.I paid a visit to was once our primary school the workers use as a store.
— How are you getting along with your study these days? — I'm glad to see it is .
— Hello, this is Shannon. I’m afraid I won’t be able to come to your office on time. —______ ! I’ll wait for you.
The stamps, once ____, will be very popular with stamp-collectors.