Which of the following statements concerning the first law of thermodynamics is/are true? 

(I) The internal energy of the universe is always increasing. 

(II) Internal energy lost by a system is always gained by the surroundings. 

(III) The universe is an isolated system. 

1. I only 

2. I and II only 

3. II and III only 

4. III only 

5. I and III only 

6. II only 7. I, II and III

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