_______we are worried about is that air pollution is becoming much heavier in Han Dan.
| A．It | B．What | C．Why | D．Which |
The employee proved ___________ to the job and the boss praised him.
| A．suitable | B．adequate | C．fit | D．useful |
The young couple decided to their wedding until all the details were taken care of .
| A．announce | B．maintain | C．postpone | D．simplify |
He was a(n) ___________singer until the age of 40, when he turned professional.
| A．gifted | B．amateur | C．sacred | D．entire |
Contrary to what I had expected, he lost for ______.
| A．second time | B．a second time | C．second times | D．the second time |
______ the works of Leonardo da Vinci, the Louvre Museum has more than 6,000 other European paintings, ranging from the13th century to the 19th century.
| A．Except for | B．Except | C．In addition | D．Apart from |