—Doctor Brown, what's your next project going to be about?
—Well, that remains .
| A．to see | B．to be seeing |
| C．to seeing | D．to be seen |
Don’t handle the vase as if it ____ made of steel.
| A．is | B．were | C．has been | D．had been |
We ______ the difficulty together, but why didn’t you tell me?
| A．should face | B．might face |
| C．could have faced | D．must have faced |
I______ thank you too much for all your help to my son while we were away from home.
| A．won’t | B．can’t | C．can | D．will |
If may car _________more reliable, I would have driven to Lhasa instead of flying last summer.
| A．was | B．had been | C．should be | D．would be |
I got close enough to hear them speaking Chinese, and I said “Ni Hao ” just as I ____ do in China.
| A．must | B．might | C．can | D．should |