______ we ______ to these immediate crises abroad, we also will not let up in our effort to deal with the pressing, ongoing challenges facing our country.
| A．With; will respond | B．As; respond | C．As; answer | D．with; will answer |
—I think your brother is managing your parents’ shop the wrong way.
—I agree. I regret _______it myself!
| A．to run | B．not to run |
| C．not running | D．running |
Upon ______the classroom， I started thinking about my mother.
| A．leave | B．leaving |
| C．left | D．to leave |
Although it had been________ struggle for him to finish______ experiment, he enjoyed the result with________ satisfaction.
| A．the, an, / | B．a, the, / |
| C．a, an, a | D．/, the, a |
The map is one of the best tools a man has ________ he goes to a new place.
| A．whenever | B．whatever |
| C．wherever | D．however |
It is reported that the local police ________ the case of two missing children, but no much progress has been made up to now.
| A．looked into | B．will look into |
| C．have looked into | D．are looking into |