John often goes to school _____.

— ______sleep do you think is necessary for a Grade 9 student? — 8 hours at least. 

—      is the zoo from the bus stop?    — It’s about 10 minutes’ walk .

Simon always feels sure about his own ability, he is so ______ 

— You must _________ your son. — Oh, I see. He must make mistakes at school again.