Don’t respond to any e-mails ______ personal information, no matter how official they look. 
| A．searching | B．asking | C．requesting | D．questioning |
“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 |
“OK．Bingo!We win．_________, mom!” shouted Daniel，raising his hand．
| A．Give me five | B．You don’t say | C．Good heavens | D．Don’t mention it |
Last night, before the exam, I went over the lessons I couldn’t keep my eyes open to stay awake any longer.
| A．before | B．until | C．unless | D．when |
Too high house prices can be brought under control the authorities introduce a series of regulatory policies.
| A．even if | B．as if |
| C．so that | D．provided that |