16 :Can you find the sound／eə／in the underlined parts of the following words?
A. here B.clear C,chair D.ear
17: The data of PM 2.5is giving us a big______．Can we do something about it?
A. break B. excuse C.hand D.headache
18. There is _______as good as the taste of a fresh apple, especially in the fall.
A. nothing B.everything C. something D.anything
19.- -The song is, I have to say, not a bit beautiful.
--Why? It’s________ than the songs I have ever heard.
A. any less beautiful B: much less beautiful
C: many more beautiful D:much more beautiful
