As is known to us all, under no circumstances______ temporary economic development at the expense of the environment and resources.
| A．should we seek | B．we should seek |
| C．we had sought | D．had we sought |
I’ll appreciate _______ if you do me the favor to send this message to Mr. Allen.
| A．that | B．it | C．this | D．you |
--- You promised to call me last night.
--- I called, but I just couldn’t _______.
| A．get through | B．get across | C．get down | D．get around |
Even if you are an experienced teacher , you sometimes _____ make some mistakes.
| A．can | B．must | C．should | D．will |
-----An ant has two stomachs --- one for itself, one for others.
-----Really? Quite interesting. I ____ anything about it.
| A．don’t know | B．have known | C．haven’t known | D．didn’t know |
We must work hard and make _______ continuous progress so that we can make _______great contribution to our country in the future.
| A．/ ; a | B．the ; a | C．a ; a | D．/ : / |