These shoes look very good. I wonder _______.
| A．how much cost they are | B．how much do they cost |
| C．how much they cost | D．how much are they cost |
He bought some books, ______ were expensive.
| A．most of which | B．the most of which |
| C．most | D．the most of that |
The city was difficult ________, _________ was defended by an army of 6,000 men.
| A．to be taken; which | B．to take; that |
| C．to take; which | D．to be taken; that |
---- Could you do me a favour and take the box up to the six floor? ---- ______. No problem at all.
| A．With please | B．My pleasure | C．For pleasure | D．at your pleasutre |
How did you manage to get to school on time ______ you missed the school bus?
| A．when | B．if | C．once | D．because |
In no case ______ allowed to go on.
| A．should such a thing be | B．should not such a thing be |
| C．such a thing should not be | D．such a thing should be |