Earth is only home to everyone．Let's try to make it greener world to live in．（ ）
A．a；aB．the；aC．a；theD．the；the
I'd like to tell you about the table manners ____you should know when you visit France．（ ）
A．whichB．whoC．whatD．how
Could I invite my friends to the party on Saturday，Mom？
Of course you _____．That sounds like fun．（ ）
A．mayB．couldC．mustD．can
As a teacher，I really feel worried to see so many students ____glasses．（ ）
A．wearingB．dressingC．putting onD．being in
What do you think of the movie The Fate of the Furious 8？
It is______! I enjoy it very much．（ ）
A．friendlyB．fantasticC．awfulD．noisy
It's best to stay indoors，________when PM2.5 has reached dangerous levels．（ ）
A．exactlyB．possiblyC．especiallyD．generally