【2015·陕西】At college, Barack Obama didn’t know that he the first black president of the United States of America.
| A．was to become | B．becomes | C．is to become | D．became |
You won't find paper cutting difficultyou keep practicing it.
| A． | even if | B． | as long as | C． | as if | D． | ever since |
—Did you have difficulty finding Ann'house?
—Not really.She___us clear directions and we were able to find it.easily?
| A．was to give | B．had given |
| C．was giving | D．would give |
In the last few years,China ___ great achievements in environmental protection.
| A．has made | B．had made | C．was making | D．is making |
He is a shy man,___he is not afraid of anything or anyone.
| A．so | B．but | C．or | D．as |
Opposite is St.Paul's Church,___you can hear some lovely music.
| A．which | B．that | C．when | D．where |