9． --I rang you yesterday afternoon. A man answered, but I didn’t recognize the voice.
--Oh，it____ my uncle. He was in my room then.
| A．should have been | B．should be | C．must have bee | D．must be |
In Shanghai, people______ thousand tons of watermelon every summer.
| A．swallow | B．eat | C．consume | D．exhaust |
We regret to inform you that the materials you ordered are out of________.
| A．work | B．reach | C．stock | D．practice |
When you are going upstairs, please_____ your head.
| A．attend | B．notice | C．mind | D．observe |
The new method he suggested sounded good in_______,but is not practical in use.
| A．opinion | B．policy | C．theory | D．principle |
After the president made an official announcement, she expressed her_____ opinion.
| A．personal | B．private | C．single | D．individual |