________ a child begins school, he enters a world of fierce competition where success and failure are clearly defined and measured.
—Can I help you, Madam? — No, thanks. I_______.
—Tom came back home the day before yesterday. — Really? Where __________ at all?
—Who is the old man talking with your teacher? —I don’t know. I _________ him before.
You needn’t hurry her; she _______ it by the time you are ready.
Our team was ahead during the first half, but we ________ in the last ten minutes.