A mistake ______ have been made on our bill. We didn’t order any fish today.
| A．should | B．would | C．could | D．must |
Russia's withdrawal of its experts from China did not strangle (压垮) the Chinese people; _____ it stirred up their enthusiasm for greater exertions.
| A．on the other hand | B．on the contrary |
| C．to the contrary | D．in consequence |
. She has lost her handbag with the _____ sum of $150 in it.
| A．extraordinary | B．important |
| C．considerable | D．valuable |
. Many people complain of the rapid _____ of modern life.
| A．rate | B．pace | C．speed | D．growth |
. The government is _____ and will take the necessary steps to maintain security and stability.
| A．on the alert | B．out of control |
| C．on guard | D．in vain |
Carl wanted to play a joke on Bob but gave himself _____ by laughing.
| A．away | B．in | C．out | D．up |