—Why do you look so worried?
—Fred left the company half an hour ago. His work _______ unfinished since.
| A．left | B．was left | C．has left | D．has been left |
It’s a bad habit to leave the work ______.
| A．undo | B．undone | C．undoing | D．done |
Do you know the name of the play___ in the hall now?
| A．to be put on | B．being put on | C．put on | D．putting on |
She was surprised to find the house _____ into when she went back home.
| A．broke | B．broken | C．break | D．breaking |
His novel has ________ him such a reputation.
| A．earned | B．won | C．obtained | D．acquired |
Cloning an animal is a complex ________ that can go fatally wrong at any stage.
| A．process | B．regulation | C．step | D．method |