________ many times , he finally understood it.
| A．Told | B．Telling | C．Having told | D．Having been told |
Two lawyers have donated $50,000 to ________ our school’s campaign “Help the Needy”, which was started by our former headmaster three years ago.
| A．sponsor |
| B．launch |
| C．organize |
| D．plan |
The new safety regulations were agreed on after _____ with the work-force.
| A．conference |
| B．participation |
| C．intervention |
| D．consultation |
Our goods with a (an) ________of colors and patterns can meet the demand of customers at different levels.
| A．variety |
| B．category |
| C．amount |
| D．species |
If you want to see the chairman of the department, you’d better make an _________ with his secretary first.
| A．assumption |
| B．appointment |
| C．agreement |
| D．admission |
It was along the Mississippi River _________ Mark Twain spent much of his childhood.
| A．how |
| B．which |
| C．that |
| D．where |