Can I tell Peter about the news?—No, I don’t want anyone else to know it. You ______ keep it to yourself.

She some mistakes in her exercises the day before yesterday.

Who ran_______ of all in the sports meeting? – Hector did, I think.

Look at the boy running on the playground. Is it David? —It ______ be him. I saw him go to the teachers’ office just now.

He found _________important to protect wild birds.