----Have they finished the project?
---- Yes. By the end of last month, they ______ it. Now they ______ on a new one.
| A．had finished; are working | B．had finished; work |
| C．have finished; are working | D．have finished; work |
Nobody in the class except you and me _____ to the principal about the air quality problems.
| A．has complained | B．have complained |
| C．complain | D．complaining |
There is an increase of 16% in the consumption of tobacco_____ the previous year.
| A．over | B．than | C．to | D．then |
They are going to have the serviceman ____ an electric fan in the office tomorrow.
| A．install | B．to install | C．to be installed | D．installed |
When he arrived, he found ____ the aged and the sick at home.
| A．nothing but | B．none but | C．none other than | D．no other than |
You cannot be ____ careful when you drive a car.
| A．very | B．so | C．too | D．enough |