Under the new schedule, teachers of primary and secondary schools must _____each class on time instead of adding extra lessons.
Though they had a meeting yesterday, there is still much that remains______.
The students expected there ________ more free time before the test.
They tried to prevent the damage ________ their cattle.
His father disappeared, ________ two children and never _______ from again.
Does the way you thought of ________ the water clean make any sense?