The old lady likes to keep things in the house, _____ throw them away, though many are useless.
Do you know the Three Gorges Dam is the largest hydro-electric dam ever_______?
English is a language shared by several different cultures, but each of ______ uses it somewhat differently.
Have you ever had the case _______ you can’t recognize your friend’s voice on the phone?
He made another wonderful discovery,_____ of great importance to science.
When the poor old lady tried to ______ the cup on the shelf to have a drink, she ______.