You can’t camp you like these days. Many natural areas are now under protection.
| A．what | B．when | C．wherever | D．which |
_____, tears came down.
| A．Hearing the bad news | B．Heard the bad news |
| C．when to hear the bad news | D．When he heard the bad news |
They peasants did what they____ the crops, but failed.
| A．could save | B．could saving | C．could to save | D．could saved |
When the old man _______ to walk back to his house, the sun ________ itself behind the mountain.
| A．started; had already hidden | B．had started; had already hidden |
| C．had started; was hiding | D．was starting; hid |
In 1960, this was the longest bridge that __________.
| A．was ever built | B．had ever built |
| C．has ever been built | D．had ever been built |
―Why? Where is the key to the sound lab?
―Dear me! You _______ it in the taxi！
| A．have never left | B．never left |
| C．haven’t left | D．didn’t leave |