Due to bad weather，the police had to __________the search for the missing boy.
| A．resign | B．abandon | C．conduct | D．release |
.
The question then ______ that the supply of drinking water in the mountainous area is serious.
| A．rises | B．arises | C．raises | D．assesses |
.
We could hardly believe what she says because she is ______ changing his mind.
| A．regularly | B．steadily | C．suddenly | D．constantly |
.
. —OK, $ 500, but that is my last offer.
—_______.
| A．Good idea! | B．What did you say? | C．Oh, it's up to you. | D．OK, it's a deal. |
.
To deal with the global financial crisis, China ______ the international community to help developing countries.
| A．called on | B．called up | C．called in | D．called for |
.
I don't remember how many years ago ______ people began to grow crops.
| A．it was when | B．it was that | C．was it when | D．was it that |