The building has a smoke detector ______ any fires can be detected immediately.

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.

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

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

John congratulated us _______ our exam with high marks.

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