21 ------ He runs his own company at the age of 21.
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| A．Good luck! | B．That’s quite something |
| C．Congratulations! | D．It’s hard to say. |
A cook will be immediately fired if he is found _______ in the kitchen.
| A．smoke | B．smoking |
| C．to smoke | D．smoked |
The boy wanted to ride his bicycle in the street, but his mother told him _______.
| A．not to | B．not to do |
| C．not do it | D．do not do |
We looked everywhere for the keys, but they are nowhere _______.
| A．to find | B．to have found |
| C．to be found | D．being found |
He was reading his book, completely _______ to the world.
| A．lost | B．losing |
| C．to lose | D．to have lost |
She looks forward every spring to _______ the flower-lined garden.
| A．visit | B．paying a visit |
| C．walk in | D．walking in |