— You should have paid the bill for her.
— I _____ to, but she refused.
| A．offered | B．have offered |
| C．had offered | D．was offering |
He did well in the examination. He _____ hard at his lessons..
| A．must have worked | B．can have worked |
| C．will have worked | D．has worked |
No one knows exactly when our ancestors started talking, but new evidence suggests that____ might have happened a long time ago.
| A．which | B．what | C．it | D．they |
On seeing the damage he had done to his kind neighbor’s house, the child felt______.
| A．ashamed | B．shy | C．sure | D．proud |
The film star has asked _______ but the journalists just keep following him wherever he goes.
| A．to leave alone | B．left alone | C．to be left alone | D．being left alone |
Huge quantities of fresh water ______there since the serious drought in the southern parts of China
| A．have sent | B．have been sent | C．has been sent | D．has sent |