Once the problem _________，all other problems will be solved.
| A．has solved | B．was solved |
| C．is solved | D．will be solved |
（2012福建卷）We lost our way in that small village, otherwise we________ more places of interest yesterday.
| A．visited | B．had visited | C．would visit | D．would have visited |
If we _______ adequate preparations, the conference wouldn’t have been so successful.
| A．haven’t made | B．wouldn’t make |
| C．didn’t make | D．hadn’t made |
（2012全国新课程）I use a clock to wake me up because at six o'clock each morning the train comes by my house.
| A．couldn't | B．mustn't |
| C．shouldn't | D．needn't |
I’m going to Europe on vacation together with John if I _______ find the money.
| A．can | B．might | C．would | D．need |
Don’t handle the vase as if it ____ made of steel.
| A．is | B．were | C．has been | D．had been |