_____ puzzles me most is that I don’t know ______ the difference between the two lies.
| A．What, how | B．What, where | C．That, what | D．How, which |
You want to tell me, and I have no objection ______ it.
| A．to hear | B．to hearing | C．hearing | D．having heard |
More than a year later he arrived back in America ______.
| A．ill, tired and unhappy | B．with ill, tired and unhappy |
| C．felt ill, tired and unhappy | D．be felt ill, tired and unhappy |
The reason Beethoven went away to the country is ______.
| A．that he was gradually going deaf |
| B．because he was gradually going deaf |
| C．on account of the fact that he was gradually going deaf |
| D．since he was gradually going deaf |
It is hard to imagine a large city without policemen, but such was the ______ in London in the early 18th century.
| A．condition | B．affair | C．environment | D．situation |
Prices reach equilibrium at the level at which quantity demanded ______ quantity supplied.
| A．is equal to | B．equal | C．equals to | D．is equal |