—I wonder what makes you a successful manager.
—I ________ as a waiter for five years，which contributes a lot to my today’s work.
| A．serve | B．have served | C．had served | D．served |
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 |