-How many letters you to your mother?
-109 in all, since 2016.( )
has, written
have, written
did, write
are, writing
Is that Tom over there?
It _____ be him. He is on the plane to Chengdu now.( )
can't
might not
must
Sally's favorite _____ is orange.
I see.That's why all her sweaters are orange.( )
fruit
color
juice
That's the boy ____ won the first prize in the competition yesterday.( )
who
which
whom
We all look forward to ____ you again soon.( )
see
seeing
seen
Do you know ____ ?( )
how old is he
how old he is
he is how old