There are so many foggy days these days. We all wonder .A. how is the air polluted B. why the air is polluted seriouslyC. what are the real reasons
A lot of good teachers ____ their students .
--Where is Tom? --He ____ in the big room.
It’s eight o’clock . The students ____ an English class.
There are forty ____ in our school.
Tigers are ____ scary, so I’m afraid of them .