13. Choose the right word. 1) Is this your/yours mobile? 2) It's their/theirs problem. 3) Are these your/yours shoes? 4) Is this camera your/yours? 5) That's not my/mine umbrella. My/mine is blue. 6) They know our/ours address but we don't know their/ theirs. 7) They have two children but we don't know their/theirs names.

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