with the size of the whole earth, the highest mountain doesn't seem high at all.
| A．When compared | B．To compare |
| C．While comparing | D．It compared |
_____ was known to them all is that Bob had broken his promise _____ he would give them a rise.
| A．As; which | B．What; that | C．It; that | D．It; which |
______earlier, I' d have told you.
| A．If I would have known it | B．Had I known it |
| C．If I knew it. | D．Should I know it |
. Please tell me how the accident _________ . I am still in the dark.
| A．come to | B．come by | C．come across | D．come about |
Jack always sleeps late on Sundays. I am sure he _______ when we get home.
| A．is still sleeping | B．is to be sleeping |
| C．will still be sleeping | D．will have been sleeping |
They suspected that the secret had been________ by one of their colleagues．
| A．given up | B．given in | C．given out | D．given away |