The teacher told us to remain silent unless _____.
| A．to be asked | B．being asked | C．asked | D．you asked |
The two girls are so alike that strangers find ______ difficult to tell them apart.
| A．it | B．them | C．her | D．That |
He is busy now, otherwise he ______ go with you for a walk.
| A．will go | B．go | C．would go | D．would have gone |
Having a trip abroad is certainly good for the old couple, but it remains _____ whether they will enjoy it.
| A．to see | B．to be seen | C．seeing | D．Seen |
---How long will you stay here?
---I don’t know. ________.
| A．Never mind. | B．That’s OK. |
| C．It doesn’t matter. | D．It depends. |
Since then the number of people taking driving lessons _______ 20%.
| A．has reduced to | B．has reduced by |
| C．reduced by | D．reduced to |