we need （two） cups of orange juice .对框里提问.___ ___ ____ ____ orangejuice do you need?

we need （two） cups of orange juice .对框里提问.___ ___ ____ ____ orangejuice do you need?
there are （twenty） boys in our class.对框里提问.
— — — arethere in your class.
he wants (two slices) of bread.对框里提问.
_ _ _ does he want?（三个空）