26．Though ____ to go to bed many times, the little boy just turned a deaf ear and fixed his eyes on the cartoons．
| A．urging | B．being urged | C．urged | D．having urged |
Plastic parts can __________ metal ones in many machines. But they don't last long.
| A．substitute with |
| B．be replaced with |
| C．take the place of |
| D．in place of |
Large quantities of china made in Dehua __________ to the US and Europe.
| A．has exported |
| B．will export |
| C．is exported |
| D．are exported |
-It's said that scientists have made __________ big breakthrough in the cancer treatment.
-If so, many people can have been brought back to __________ life ！
| A．a; / |
| B．/；a |
| C．the; the |
| D．a; the |
The police __________ searching for the murderer everywhere when he suddenly appeared in a theatre.
| A．is |
| B．was |
| C．are |
| D．were |
Experiments of this kind __________ in both the U. S. and Europe well before the Second World War started.
| A．have conducted |
| B．have been conducted |
| C．had conducted |
| D．had been conducted |