There are so many foggy days recently.We all wonder_________.( )
A.how is the air polluted
B.why the air is seriously polluted
C.what can we do to prevent that bad weather
D.what are the real reasons
In the evening,I either watch TV play computer games to relax myself.( )
or
and
nor
It is said that thirteen is unlucky number in many Western countries.( )
a
an
the
﹣I think wearing seat belts is very important for road safety. ﹣_____( )
That's all right.
I'm sorry.
That's a good idea.
I agree.
﹣_____﹣It's a pleasure.( )
Don't worry about the task.
Thank you for showing me around.
Be careful when you travel.
You' d better go to the dentist's now.
Vivian will take her daughter to the amusement park_____she gets the tickets.( )
if
until
although
unless