We students should ________ our teacher carefully in class.
A.listen B.listen to C.sound D.hear
The man said hello to me，but I ________ know him ________.
A.not；at all B.not；in all
C.didn't；at all D.didn't；in all
Tim Cook called his mother every week even while he_______ around the world.
A.was traveling B.is traveling
C.traveled D.travels
There's something wrong with my teeth. I have to see a ________.
A.driver B.worker C.dentist D.scientist
His mother often tells him________ too much time playing games.
A.not to spend B.don't spend
C.spends D.spending
They are on their way ________ home.
A.to B.for C./ D.at
