The flowers his friend gave him will die unless______ every day.
| A．watered | B．watering | C．water | D．to water |
Because paper is very expensive, we must ____ it with other things.
| A．replace |
| B．abandon |
| C．remove |
| D．exchange |
The parents have the ____ to teach their children to follow all school rules.
| A．ability |
| B．responsibility |
| C．chance |
| D．possibility |
We're going to be meeting there on a regular ____.
| A．basis |
| B．fact |
| C．bottom |
| D．reason |
The elephant and the monkey went to the river, but the water was ____ and the monkey was afraid.
| A．swift |
| B．clear |
| C．fine |
| D．hard |
______ regular exercise is very important,it's never a good idea to exercise tooclose to bedtime.(2011 .天津)
| A．It |
| B．As |
| C．Although |
| D．Unless |