The dance performed by the disabled actors is really a hit, but years ago no one ______ they were to achieve such great success.
| A．must have imagined |
| B．could have imagined |
| C．should have imagined |
| D．would have imagined |
Difficulties are nothing ___ we are not afraid of them.
| A．for | B．as | C．if | D．whether |
―When do we need to pay the balance ?
― September 30.
| A．In | B．By | C．During | D．Within |
I'd like to go swimming ____ the water is not too cold.
| A．for | B．unless | C．if | D．whether |
It’s quite me why such things have been allowed to happen.
| A．for | B．behind | C．against | D．beyond |
I can't use your pen, ___ there is no ink in it.
| A．for | B．when | C．if | D．whether |