It is so good a habit to instruct children to lay things _______ they belong when they are young.

The flu is believed____ by viruses that liketo reproduce in the cells inside the human nose and throat.

I failed in the English exam, I have no _______ but study hard for the next exam.

The school bus picks up thestudents ________ the morning.

When the old man ____ to walk back to his house, the sun ____ itself behind the mountain.