Hangzhou is __________beautiful city，and it is worth__________.
| A．a most；visiting | B．the most；to visit |
| C．a most；to visit | D．the most；visiting |
________，Carolina couldn't get the door open.
| A．Try as she might | B．As she might try |
| C．She might try as | D．Might as she try |
________ the jewels were locked in a strong box，the thieves stole them without any difficulty.
| A．If | B．Unless | C．Although | D．Because |
________ he comes or not，the result will be the same.
| A．Even if | B．Whether | C．No matter | D．Although |
________ volleyball is her main focus，she's also great at basketball.(2011·北京)
| A．Since | B．Once | C．Unless | D．While |
________ hard you try，it is difficult to lose weight without cutting down the amount you eat.(2012·湖南)
| A．However | B．Whatever | C．Whichever | D．Whenever |