Have you____Betty yet? — Not really. She won’t forgive me for having told her lies.

___________ is known to everybody, the noon travels around the earth once every month.

Teachers should _____ fundamentals and difficult points in order to enable students toacquire newmaterial. [ ]

I know smoking is bad for my health， ____ I just can’t give it up.— It is easier said than done.

He was___________ tired___________ he fell asleep as soon as he lay down.—Oh, we can go out and let him have a good rest.