What’s the use of keeping the secret ______ everyone has already known it?
In the playground I saw a boy ___ I thought was your brother.
--- Mr Wang, I have trouble _______ the text. ---- Remember ________ it three times at least.
---- Will you answer the telephone? It ________ be your mother. ---- Sorry, I _______. I’m very busy.
My parents will go there by taxi because it is raining _______.
---- Excuse me, is the supermarket far from here? ---- No, it’s about ________.