Fleming discovered penicillin almost by______.
| A．experiment | B．hand | C．accident | D．theory |
The professor had no sooner finished his speech ________ the students started cheering.
| A．since | B．when | C．than | D．as |
________into English, the sentence was found to have an entirely different word order.(2011·天津)
| A．Translating | B．Translated |
| C．To translate | D．Having translated |
—Did you have a chat with Tom?
—No, I was trying to ________ an opportunity to do so, but I couldn't.
| A．hold | B．ask | C．seize | D．make |
．The policeman caught the thief by ________ arm.
| A．a | B．an | C．/ | D．the |
Affected by their good deeds, I was ________ to join them in helping the old.
| A．anxious | B．worried | C．curious | D．eager |