Tom with his friends _______ to Shanghai many times before.( )
have gone
have been
has gone
has been
We enjoyed __ at English party last weekend.( )
us
our
ours
ourselves
The environment here becomes better and better. birds are coming back.( )
Hundred
Hundreds
Thousand
Thousands of
More trees every year to make our city greener.( )
is planted
are planted
was planted
were planted
To avoid making mistakes, please read the questions before you answer them.( )
careful
careless
carefully
carelessly
Hong Kong is __ the south of China, it's one of the busiest cities in the word.( )
in
on
at
to