—How long are you staying?
—I don’t know．______．
| A．That’s OK | B．Never mind | C．It depends | D．It doesn’t matter |
Is this _____ ?
| A．you are looking for | B．that you are looking for |
| C．what are you looking for | D．what you are looking for |
The trouble is _____ we are short of hands.
| A．what | B．that | C．how | D．why |
. The guide showed the travelers _____ of the factory.
| A．in | B．out | C．off | D．around |
We should mind our behaviour ______ public.
| A．at | B．in | C．on | D．out |
They made a bet _____the white horse.
| A．for | B．with | C．on | D．in |