This is not an economical way to get more water; _________,it is very expensive.
| A．on the contrary | B．on the other hand | C．in a word | D．rather than |
We will debate the subject_____ late when we have enough time.
| A．in vain | B．at length | C．at last | D．in force |
We will debate the subject_____ late when we have enough time.
| A．in vain | B．at length | C．at last | D．in force |
While watching television, __________.
| A．the doorbell rang | B．the doorbell rings |
| C．we heard the doorbell ring | D．we heard the doorbell rings |
John, look at the time. ___________ you play the piano at such a late hour?
| A．Must | B．Can | C．May | D．Need |
_____in a well—known university is what everybody wishes for.
| A．Educated | B．Being educated | C．To educate | D．Educating |