They considered a computer, which was considered a great help in their work．
| A．to buy; to be | B．buying; being | C．to buy; being | D．buying; to be |
The girl came ______ to school, extremely ______and quite out of breath.
| A．running; tiring | B．run; tired | C．running; tired | D．run; tiring |
Everyone was in silence, having nothing to do but _________.
| A．to wait | B．wait | C．waiting | D．waited |
_________ his work , he can’t play with his friends.
| A．Not finishing | B． Finishing not | C． Not finish | D． Not finished |
All I have to do is _________my life .
| A．to enjoy | B．enjoy | C． having enjoyed | D． enjoyed |
When _______ homework , you should be careful .
| A．do | B． to do | C．doing | D． done |