____ has never occurred to us that the accident can do so great harm to the family．
| A．That | B．It | C．This | D．One |
She spent 25 dollars on the watch chain.It means ___.
| A．she paid 25 dollars on the watch chain | B．the watch chain cost her 25 dollars |
| C．it took her 25 dollars buying the watch chain | D．she bought the watch chain of 25 dollars |
After two days of long walk, his strength gave __.
| A．off | B．out | C．un | D．up |
No matter what they say, I’ll ___ my opinion.
| A．stick to | B．persist in | C．insist on | D．hold up |
He ___ to break the record for the long-distance race.
| A．set out | B．set off | C．set up | D．set down |
__ your courage, ___ you will not fail.
| A．Keep to…then | B．Keep up…and | C．Keep up with…and | D．Keep on…so |