Many scientists believe that the universe began with an enormous explosion called the “Big Bang”, _____

Many scientists believe that the universe began with an enormous explosion called the “Big Bang”, ______ happened about 13.7 billion years ago.

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I’ve read all the books ________ you gave me.

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Living in the central American desert has its problems, ________ obtaining water is not the least .

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Look out! Don’t get too close to the house ________ roof is under repair.

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He bought a house,___________  the price is reasonable.

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 Do you know the boy_________ father died in the fire?

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