While he was investigating ways to improve the telescope, Newton made ____ discovery which completely changed ________ man’s understanding of color.
| A．a ; / | B．a ; the | C．/ ; the | D．the ; a |
Those who are not ___ with the progress they 've made will have greater success.
| A．proud | B．afraid | C．popular | D．content |
The number 9.11 is a special number, ___, I think, that will be remembered by the Americans forever.
| A．what | B．it | C．which | D．one |
Like some of my classmate, I can’t live up to my teachers’ expectations; ______, I let them down.
| A．in other words | B．after all | C．what’s more | D．more or less |
It is suggested that a hard line ____ towards terrorists.
| A．adopts | B．will be adopted | C．be adopted | D．is adopted |
Good friends as we are, I still find her difficult to understand ________.
| A．at one time | B．at a time | C．at times | D．at the time |