Mrs. Black doesnt believe that her son is able to design a digital camera, ______?
It was ___ the quality of life in the future ___ I took this training course, not just to make more money.
With a lot of difficult problems _, the manager felt like a cat on hot bricks.
Mr Black has two sons, one of ________working as a doctor.
—Who is the man ______ by a group of students there? —A professor _____ research on physics.
— You were late again, Peter. —Sorry, I ______ to be here on time, but the traffic on the roads _____ heavy.