--Is your ball the door ? --No, it’s the chair.
| A．in, behind | B．of, on | C．behind, on | D．on, in |
They have more than 6 ________ books in the library.
A. millionB. millions C. millions of
No ________ here! Haven’t you seen the sign?
A. smoking B. to smoke C. smokes
They managed ________ the work on time.
A. finishing B. finished C. to finish
The physics problem is very difficult. Can you ________?
A. work out itB. work it out C. work it on
This computer is the best one ____ the shop, but it is also the most expensive ___all the computers.
| A．in, of | B．in, in |
| C．of, of | D．of, in |