_____ the catastrophe happened that the local government realized the importance of substantial development.
| A．It was until | B．Not until | C．Until | D．It was not until |
No advertisement so far______can have the same effect as this one.
| A．made | B．has been made | C．being made | D．to be made |
A healthy life is frequently thought to be______with the open countryside and home-grown food.
| A．tied | B．related | C．involved | D．associated |
—Wow,your picture looks splendid!
—I______it on my computer.
| A．drew | B．draw |
| C．will draw | D．had drawn |
In the past,ice ______food.
| A．used to keep |
| B．used to be used for keeping |
| C．was used to keeping |
| D．used to be used to keeping |
Enough______ to stop the forest______ since the 1980’s.
| A．has been done;be cut down |
| B．has done;cutting down |
| C．has been done;being cut down |
| D．had done;from being cut down |