—The lights were left on all night long.
—Oh. It seems that Tom is ____. Only he stayed in the classroom when I left yesterday evening.
| A．blaming | B．blamed |
| C．to be blamed | D．to blame |
Stephen Hawking believes that the earth is unlikely to be the only planet _life has developed gradually.
| A．that | B．where | C．which | D．whose |
---- An ant has two stomachs --- one for itself and the other for others.
----Really? Quite interesting. I ________ anything about it.
| A．don’t know | B．hadn’t known | C．haven’t known | D．didn’t know |
Scientists say it may be one year or so ________ it is possible to test the new medicine on human patients.
| A．when | B．after | C．before | D．since |
It is reported that 70% of people in China are ________ about the food security situation after so many accidents.
| A．curious | B．concerned | C．cautious | D．certain |
You have made a few mistakes in your composition but _______ you have done well.
| A．on the whole | B．first of all | C．on the other hand | D．in a word |