—Please go on with your demonstration．
—But where was I?
—Well, you_____the two chemicals together．
| A．tried to mix | B．were trying to mix |
| C．were trying mixed | D．had tried to mix |
These students are quick at learning. We'll have them __________ with new methods.
| A．training | B．to train |
| C．to be trained | D．trained |
What he lacks is more patience,___________?
| A．isn't it | B．is it | C．doesn't he | D．does he |
I told him what I was surprised____________ his attitude towards his study.
| A．is | B．was | C．at is | D．at was |
I've visited a lot of different places and stayed in lots of different hotels, but none of them____________ this one.
| A．makes | B．beats | C．compares | D．matches |
The visiting Minister expressed his satisfaction with his talk,__________ that he had enjoyed his stay here.
| A．having added | B．to add | C．adding | D．added |