. So far nobody has claimed the money ___________________in the library.
| A．discovered | B．to be discovered | C．discovering | D．having discovered |
He traveled to many mountain villages and saw many poor children out of school. This experience ___________ his life.
| A．would change | B．had changed |
| C．was to change | D．was changing |
I should very much like to have gone to the party but I _________.
| A．am not invited | B．am not being invited |
| C．shall not be invited | D．was not invited |
My dictionary _________, I have looked for it everywhere but still ________ it.
| A．has lost, don’t find |
| B．is missing, don’t find |
| C．has lost, haven’t found |
| D．is missing, haven’t found |
The students ________ busily when Miss Brown went to get a book she ______ in the office.
| A．had written, left | B．were writing, has left |
| C．had written, had left | D．were writing, had left |
By _____, water can be changed into gas.
| A．heating | B．being heated | C．having heated | D．heated |