They shift: think about it, the sentence doesn't make sense.
Answer:
Depending on the context you may consider antonyms to ostentatious such as reserved or modest. The word you are looking for is something like patina or tarnish.
During a speech, especially to a large group or crowd, it is essential that the visual aid not only convey the message to the listener but should first catch the attention of the audience. Among the given choices, the best illustration that would fit with the presentation of the artistic style of Diego Rivera is the "slideshow of his most famous work".
It is important to know what your are writing to whom.
emotions should never be used, use proper spelling and punctuation, use full words, avoid using colloquial words/ expressions, avoid using first and second person pronouns, avoid the use of cleche`s.do not write as you would speak, do not start a sentence with a coordinating junction, avoid using the word get.
Newspapers, magazines, journal articles,and business reports are great sources of formal writing.
