Had they known what was coming next, they ___________ second thoughts.
| A．may have | B．could have | C．must have had | D．might have had |
New technologies have made __________ possible to turn out new products faster and at a lower cost.
| A．that | B．this |
| C．one | D．it |
The two girls are so alike that strangers find __________ difficult to tell one from the other.
| A．it | B．them |
| C．her | D．that |
-Do you know our town?
-No, this __________ the first time I __________ here.
| A．was; has come | B．is; come |
| C．is; had come | D．is; have come |
Many commentators point out that this leads to a situation __________ more money equals more power.
| A．where | B．when |
| C．on which | D．how |
Was it in the village __________ we used to live in __________ the accident happened?
| A．where; that | B．which; that |
| C．that; where | D．where; which |