Work hard at your lessons, ______ you’ll fail the exams again.
— Leo, I finally persuaded my mother. — So we can go to the basketball club tonight.
Had he studied harder, he______the final exams.
Our parents always tell us to believe in_______we do if we want to succeed.
_____entering the classroom, remember to take your seat and turn off your cell phone.
Our previous school building,______ like an“E”, was built in1961.