Have scientists found life on Mars?
Not yet, but I think they ______ it some day.( )
A.findB.foundC.have foundD.will find
Get up early,_____ you will miss your train.( )
or
and
but
I _____ a math problem with Joe when Mike called me up.( )
have discussed
discussed
was discussing
The nurse _____ is looking after the old man is Tom's sister.( )
which
who
what
She is_______famous singer in China and has many fans.( )
the
a
an
Helen's mother always goes shopping____ Friday afternoons.( )
in
on
at