The poor man’s life was _________ the king.
| A．at the mercy of | B．at the call | C．at the service | D．at the experience |
__________ she couldn't understand was__________ fewer and fewer students showed interest in her lessons.
A. What; why B. That ; what C. What ; because D.
Scientists say it may be five or ten years___________ it is possible to test this medicine on human patients.
| A．since | B．before | C．after | D．when |
Neither of them knew what_____ was doing.
| A．other | B．others | C．the other | D．another |
The murderer was brought in, with his hands _____behind his back.
| A．to be tied | B．being tied | C．tied | D．having tied |
--" Would you mind the window? It's hot here!" May said.
--"__________. "Tom replied.
| A．to open ; No, please | B．open ; Yes, please |
| C．opening; No, of course not | D．opening ; Yes, please |