25. ------- What’s that noise?
--------- Oh, I forgot to tell you. The new machine ____________.
| A．was tested | B．will be tested |
| C．is being tested | D．has been tested |
My son has gone abroad．I’m looking forward to him ______．
| A．return | B．to return |
| C．returning | D．returned |
_____ in the woods，the two girls were frightened and kept crying．
| A．Having lost | B．Lost |
| C．To be lost | D．Being lost |
I ______ to reach the manager for the last two hours but the line is always busy．
| A．tried | B．have tried |
| C．had tried | D．have been trying |
——How do you usually go to work？
——I usually drive，but if it is fine，I ______ by bike．
| A．will go | B．would go |
| C．have gone | D．had gone |
I fell asleep while working on this paper ______ the computer on．
| A．as | B．for | C．over | D．with |