They both have some friends; but his ____more active.

Zhang Heng, one of _____ best-known Chinese astronomers, showed a strong interest in _____ astronomy as a child.

He shouldhave come to join in the thorough cleaning—He _____ Idon’t think it was his turn

Somebody ______the blackboard．—Well, it wasn’t me．I didn’t doit．

Could I speak to__________ is in charge of International Sales please?