This article deals with the extent ______ family life has changed over the past 30 years.
| A．in which | B．at which |
| C．to which | D．on which |
.
— Now that you like computers very much, isn’t that a good idea to get a ______?
— Well, I’d like to, but I can’t afford such an expensive computer at present.
| A．one | B．them | C．it | D．that |
.
I have many friends, _______ some are businessmen.
| A．of them | B．from which | C．of who | D．of whom |
.
The car has been well maintained and is ________ excellent condition.
| A．in | B．under | C．on | D．with |
.
— Why was Professor Johnson unhappy those days?
— Can’t you see it clearly? The only reason was that the theory he stuck to________ wrong.
| A．proving | B．being proved | C．proved | D．was proved |
.
You can see the stars on a clear night ,but in the daytime they are____
| A．unavoidable | B．invisible | C．inaccessible | D．unavailable |