If you had worked hard, you ______ so anxious now．
| A．are not | B．would not have been |
| C．will not be | D．would not be |
Only after Mary read her composition the second time _________ the spelling mistake.
| A．she noticed | B．she has noticed | C．did she notice | D．does she notice |
______ being fun and good exercise ,swimming is a very useful skill.
| A．Apart from | B．Except | C．Except for | D．Except that |
Come and see me whenever ____.
| A．you are convenient | B．you will be convenient |
| C．it is convenient to you | D．it was convenient to you |
It is strange that he _________ in such an important examination .
| A．failed | B．should fail | C．should have failed | D．fails |
After ten hours’ operation, the doctors managed to _____the one-year-old twins at the head.
| A． tell | B．separate | C．divide | D．Remove |