How did it______ that humans speak so many different languages?
| A．come out | B．come off | C．come about | D．come round |
You can never be __________ when crossing the street.
| A．very careful |
| B．too careful |
| C．carefully enough |
| D．enough careful |
—He was nearly drowned once.
—When was __________？
—__________ was in 1998 when he was in middle school.
| A．that ； It |
| B．this ；This |
| C．this； It |
| D．that；This |
1 could just see a car in the distance, but I couldn't __________ what colour it was.
| A．make out |
| B．look to |
| C．look out |
| D．take in |
After ten years' hard work, she finally __________ all the debts.
| A．paid |
| B．paid for |
| C．paid off |
| D．paid over |
1 don't think that taxes will be reduced this year,__________？
| A．do I |
| B．don't I |
| C．won't they |
| D．will they |