The air in Taizhou is getting ________ cleaner now than a few years ago.

______ in the near future, vision-phones will come into wider use in our ____ life.

To his disappointment, the opinion he had stuck out wrong

From this simple concept ________ that has caused a great change in farming

19－The book by Tony Garrison is of great use to our course－But I think this one is_______worth reading