—_____do you exercise?
— Every day.
How long
Why
What time
How often
Although we don't know what was discussed , we can feel the topic____( )
has changed
was changed
has been changed
I'm sure____our team will win the match.( )
if
that
when
There is a____in our zoo.( )
pigs
panda
dogs
May I do my homework now,dad?
﹣Yes,you____( )
must
may
can
This is____friend,Sam.( )
I
my
me