49.If it wasn't too hot then, we wouldn't consume a lot of energy

50.Despite his poor health, he takes part in all of his school activities

51.I bought a new washing machine which cost me a lot of money

52.I couldn't get into the house because I didn't have the key
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49, It is too hot now. That’s why we consume a lot of energy. (if)

=> If it wasn't too hot then, we wouldn't consume a lot of energy

50, He takes part in all of his school activities. His health is poor. (despite)

=> Despite his poor health, he takes part in all of his school activities

51, I bought a new washing machine. It cost me a lot of money. (which)

=> I bought a new washing machine which cost me a lot of money

52, I didn’t have the key. I couldn’t get into the house. (because)

=> I couldn't get into the house because I didn't have the key