【2015·湖北】The team are working hard to ___ the problem so that they can find the best solution.
| A．face | B．prevent | C．raise | D．analyze |
His eyes suddenly widened. I knew a good idea must have _________ to him.
| A．happened | B．appeared | C．occurred | D．hit |
The World War II made_________ impossible for Einstein to go on with his research.
| A．him | B．it | C．this | D．that |
We had _________ great fun at the charity party yesterday. I have never had _________ more exciting experience.
| A．a, / | B．/, a | C．/, the | D．the, a |
The scientists were trying to look for all possible _______ as to where this species came from.
| A．signals | B．marks | C．clues | D．spots |
A well-written speech ______ a lot, such as a good choice of words, a clear
structure, a distinct theme, etc.
| A．calls on | B．calls for | C．calls up | D．calls off |