_____ his ability of speech, he has made use of each chance.
| A．To improve | B．Improving | C．Being improved | D．Improved |
The emergency center is in great need of O-type blood，but there is__________ at hand.
| A．nothing | B．none | C．any | D．much |
South Korean pop singer Chae Yeon came to Beijing on March 18th to__________ her new album My Love．
| A．relieve | B．release | C．collect | D．investigate |
Nelson Mandela__________ peacefully at his Johannesburg home on Thursday，President Jacob Zuma said.
| A．dies | B．died | C．has died | D．had died |
“Rubber Duck”,________ by Dutch artist Florentijn Hofman，has visited many cities since 2007．
| A．being created | B．creating | C．created | D．having created |
Of the two-child policy，_________ some see the bright side，others worry about a baby
boom in China．
| A．while | B．when | C．since | D．once |