—Did you find the missing couple in the mountain yesterday?
—No, but we __________ to get in touch with them ever since.
| A．have tried | B．have been trying | C．had tried | D．had been trying |
In 1720,Bach’s wife suddenly died, ______him with four children．
| A．leaving | B．to leave | C．left | D．had left |
The front door ________ open．I'll have it repaired．
| A．mustn't | B．shouldn't | C．may not | D．won't |
___Obama was elected president of the USA is a big success for the blacks in America．
| A．\ | B．That | C．What | D．As |
—Have you heard that eleven people were killed on the spot in the highway traffic accident?
—Yes, whatshock it is to hear news．
| A．a; a | B．a; the | C．/; / | D．the;/ |
They were kept waiting in the snow for a couple of hours,________．
| A．cold and hungry | B．coldly and hungry |
| C．cold and hungrily | D．coldly and hungrily |