He's devoted his whole life to the protection of the rare animals.
| A．保护 | B．过程 |
| C．污染 | D．位置 |
You’ll never guess who I met today — my old teacher！ We _____ for 20 years.
| A．don’t meet | B．haven’t met |
| C．hadn’t met | D．couldn’t meet |
I _____ your last point — could you say it again？
| A．didn’t quite catch | B．don’t quite catch |
| C．hadn’t quite catch | D．can’t quite catch |
They won’t buy any new clothes because they _____ money to buy a new car.
| A．save | B．were saving |
| C．have saved | D．are saving |
I left my pen on the desk and now it’s gone； who _____ it？
| A．took | B．has taken |
| C．will take | D．had taken |
We _____ to move but are still considering where to go to.
| A．are deciding | B．decided |
| C．have decided | D．had decided |