_______ in large quantities in the Middle East, oil became known as black gold because of the large profit it brought.

Students will not be allowed into the exam room if they _____________ their student cards.

Although at that time my knowledge of German was very poor, I _____________ most of what they said.

Smoking is extremely detrimental to health, _____ many people continue to smoke anyway.

You’ll probably come _________the problems of culture shocks when you study abroad.

That style of dress _______ have been designed by Titian, because it wasn’t worn till after his death.

In Viet Nam, you shouldn't ________ at somebody's house on the first day of the New Year unless you have been invited by the house owner.

According to FAO, Vietnam is ___ second largest coffee producer in the world after Brazil.