There is no decision yet ______ when the work might start．
| A．due to | B．as to | C．in addition to | D．owing to |
--- I' m surprised to hear that Sue and Paul have ________ .
---So am I. They seemed very happy together when I last saw them.
| A．broken up | B．finished up | C．divided up | D．closed up |
As there is less and less coal and oil, scientists are exploring new ways of making use of______________ energy, such as sunlight, wind and water for power and fuel.
| A．abrupt | B．alternative | C．authentic | D．abstract |
The professor could hardly find sufficient grounds _____his arguments in favor of the new theory.
| A．to be based on | B．to base on | C．which to base on | D．on which to base |
Modern science and technology has __________ communication between people far apart.
| A．made convenient | B．made it convenient |
| C．made it convenient for | D．made it convenient to |
—I’m sorry, but the manager isn’t here yet. Shall I have him call you when he comes back?
—No, I’ll call him later. If I call again in half an hour, do you think he ____?
| A．arrives | B．has arrived | C．will arrive | D．will have arrived |