If it was not an accident, he must have done it .
| A．on purpose | B．in common | C．on occasion | D．in time |
After a short holiday, he _____ himself once more to his studies.
| A．applied | B．converted | C．engaged | D．exerted |
Although he hasn't any formal qualifications, Betas _____ to do well for himself.
| A．managed | B．succeeded | C．arranged | D．convinced |
John always tries to _____ people who are useful to him professionally.
| A．develop | B．provoke | C．correspond | D．cultivate |
What a terrible experience! _____ , you are safe, that's the main thing.
| A．Somehow | B．Anyhow | C．Somewhat | D．Anywhere |
He has recently _____ chess to provide himself with some relaxation.
| A．taken on | B．taken up | C．held on | D．held up |