_____ is known to all that oil and water don’t mix up.
| A．It | B．What | C．Which | D．As |
There are trees and flowers along both sides of the road______ our school.
| A．leading to | B．defeated | C．won | D．gained |
________ , we had to go home.
| A．There was no bus | B．We couldn' t find a bus |
| C．There being no bus | D．There no bus |
I have many friends, ______ some are businessmen.
| A．of them | B．from which | C．who of | D．of whom |
There was _____ time ______ Irap was one of the strongest countries in the world.
| A．a when | B．a that | C．that that | D．the when |
The old man,_______ abroad for 20 years, is on the way back to his mother land.
| A．to work | B．working | C．having worked | D．to have worked |