1．—I have a serious headache. ________ I go to school? —No, you needn't.
A．Must B．Can C．Should D．May
2．My grandpa has a computer, but he doesn't know ________ it.
A．what to use B．how to use C．which to use D．where to use
3．Learning Chinese really ________ my mind to the Chinese world.
A．called up B．turned up C．opened up D．made up
4．My brother ________ to move the heavy box, but I didn't give up.
