.
—Must I turn off the gas after cooking?
—Of course! You can never be__________careful with that.
| A．enough | B．too | C．so | D．very |
____of the land in that district ____covered with trees and grass.
| A．two fifth; is | B．two fifths; are |
| C．two fifths; is | D．two fifths; are |
Burning all the lights in the classroom will be a great______ on electric power.
| A．waste | B．lack | C．drain | D．damage |
If you build a house with good_______ , it will last long.
| A．foundation | B．floor | C．basis | D．ground |
After many years’ waiting, Chinese people______ realized their dream to hold the Olympic Games.
| A．constantly | B．eventually | C．lastly | D．generally |
He had a talent for music and was______ conductor of Shanghai Symphony Orchestra at the age of 30.
| A．assigned | B．appointed | C．named | D．honored |