At the beginning of the twentieth century,___the population all over the world?
| A．what was |
| B．what were |
| C．how many are |
| D．how much is |
His father was pleased ___ his mark in the final exam.
| A．at | B．with | C．to | D．for |
It ____ last night, for the ground is wet now.
| A．might not have rained | B．must have rained | C．couldn't have rained | D．rained |
On her way home she had her wallet ___.
| A．steal | B．stolen | C．be stolen | D．stolen |
The capital ordered the soldiers to stay ___ among the woods.
| A．hiding | B．hid | C．hidden | D．to hide |
A lock ___ locking a door.
| A．is used to | B．used to | C．is used for | D．is used into |