49. You must go there at once because the situation prompt action.
| A．calls for | B．calls back | C．calls at | D．calls on |
John always tries to _____ people who are useful to him professionally.
A. develop B. provoke C. correspond D. cultivate
[答案]D. cultivate.
[注释]cultivate sb.结识（有地位的人），培养与......的友谊：He always tries to cultivate rich and famous people.(他总是极力结识有钱的知名人士。)
本题译文：约翰总是力图结识在职业方面对他有用的人。
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 |
It has been decided that this company has the _____ right to print Mr. Smith's novels.
| A．eventual | B．versatile | C．extensive | D．exclusive |
Jim's close _____ to his brother made people mistake them for one another.
| A．confusion | B．similarity | C．resemblance | D．imitation |