______ is a good form of exercise for both the old and the young.
| A．Walk | B．To walk |
| C．Walking | D．The walk |
Mr. Li is __________ chairman of the meeting.
| A．a |
| B．the |
| C．/ |
| D．an |
This school was the first __________ textbooks as well as reading materials.
| A．publishing |
| B．to publish |
| C．having published |
| D．published |
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 |