Choose the word or phrase ( A, B, C or D ) that best fits the blank space in the following passage.
Speech is one of the most important ways of communicating. It consists of far more than just (46)____noises. To talk or to (47)____by other people, we have to master a language, that is, we have to use combinations of sound that (48)____for a particular object or idea. Communication (49)____impossible if everyone (50)____up their own language.
(46)  A. makes   B. make   C. to make   D. making
(47)  A. understanding   B. understand  C. be understood   D. be understandable
(48)  A. to stand  B. stand   C. stands     D. standing
(49)  A. is    B. will be     C. would be      D. was
(50)  A. made    B. makes    C. make     D. will make