—Ruby, when did your father go out?
—I’m not sure, but he ______ go too far. His tea is still hot.
can’t
must
might
You shouldn’t watch TV____ school nights.
--- I can’t fall asleep. --- You get up and try to do something ______lying in bed.
________ , I know it doesn’t matter.
It’s bad for your health to go to work ______ breakfast.
How do you study English ?I study English_____ grammar.