They were also quite sure（)a cigarette end did not start the fire.

We are quite sure that we can ______our present We

They are sure they have all the facts they need to ______ the existence of a black hole.A．

A．The students attended class twice a week.B．Men were quite active during the classes.

Nowadays most people decide quite early what kind of work they would do. When I was at school, we had to choose （11 ) when we were fifteen. I chose scientific subjects. "In the future , scientists wi

He is quite sure that it's ______ impossible for him to fulfill the task within two days. A)

6. He is quite sure that it’s impossible for him to finish the task within two days.A.extremelyB.abs