Do you know the boy under the tree_______ is playing with a dog/
| A．which | B．as | C．who | D．what |
31. The chair looks rather hard，but in fact it is very comfortable to________.
| A．sit | B．sit on | C．be sat | D．be sat on |
30. Wang Tao was made_______ the dishes for a week as a punishment．
| A．to wash | B．washing | C．wash | D．to be washing |
29. When I handed the report to John，he said that George was the person______．
| A．to send | B．for sending | C．to send it to | D．for sending it to |
28.Although _____ to stop, he kept on working.
| A．tell | B．told | C．was told | D．having told |
27.The question _______ at present has something important to do with our nature.
| A．to be discussed | B．to be discussing |
| C．discussed | D．being discussed |