Our classroom is very clean and tidy because it ______ every day.( )
cleans
cleaned
was cleaned
is cleaned
Cindy, you sing the English song among all the singers.Congratulations!( )
better
best
beautifully
most beautiful
Polluted air and water kill plants, animals, and even people.( )
can
can't
should
shouldn't
With the development of China, Chinese ______by more and more people in the world.( )
speaks
is spoken
speak
is speaking
The man in blue is old to finish the difficult task in such a short time.( )
too
very
so
such
While Xiao Ming his homework, his mother came with a cup of tea.( )
has doing
had done
is doing
was doing