periment shows that proper amounts ofexercise, if __ regularly, can improve our health

It is not immediately clear__________ the financial crisis will soon be over

How did you get the news about the accident of Sewol Ship– I________by Jerry on the Internet.

When a fire _____ at the National Exhibition in London,at least ten priceless paintings were completelydestroyed. [ ]

If ________ the same treatment again, he is sure to get well [ ]