If Newton lived today, he would be surprised by what _______ in science and technology.
| A．had discovered | B．had been discovered |
| C．has discovered | D．has been discovered |
Gun control is a subject ___________ Americans have argued for a long time.
| A．of which |
| B．with which |
| C．about which |
| D．into which |
He ___________ his friends for their help at the hotel now.
| A．entertained |
| B．was entertaining |
| C．is entertained |
| D．is entertaining |
___________ I can see, there is only one possible way to keep away from the danger.
| A．As long as |
| B．As far as |
| C．Just as |
| D．Even if |
If you don't know his ___________, I think，it's very hard for you to get along with him.
| A．character |
| B．behavior |
| C．state |
| D．action |
She ___________ for three years and given birth to two children.
| A．married |
| B．has got married |
| C．has married |
| D．has been married |