You will succeed in the end ____ you give up halfway.
| A．even if | B．as though |
| C．as long as | D．unless |
—Sorry for the delay.I got lost in the mountain.
—That's OK.You're safe and that's what________.
| A．does | B．works |
| C．stays | D．counts |
—Tom has been fired by his boss.
—________？As far as I know，he is a hardworking and considerate fellow.
| A．Why not | B．How come |
| C．What then | D．So what |
Annoyed by the salesman's bad manner，John chose ________of the two computers on sale and left.
| A．all | B．either |
| C．neither | D．none |
People develop ________ preference for a particular style of learning at ________ early age and these preferences affect learning.
| A．a；an | B．a；不填 |
| C．不填；the | D．the；an |
Four and ________ half hours of discussion took us up to midnight，and ________ break for cheese，chocolate and tea with sugar.
| A．a；a | B．the；the |
| C．不填；the | D．a；不填 |