33. I can’t go to bed with an mind until I know she’s safe.

You speak very good French! — ThanksI _____ French in Sichuan University for four years[ ]

He is not very confident and always _______before making a decision.

Don’t worry. We are old enough to look after ______.

Look! It must be Jack on the playground.—It _____ be him. Because I saw him enter the school library just now.