In spite of the heavy rain, we went to school on time? he didn't have any money, but he bought an expensive mobile phone? They had to pay a large bill because they didn't use electricity economically

In spite of the heavy rain,we went to school on time
=>Although.........................................................
he didn't have any money, but he bought an expensive mobile phone
=>Although........................................................................................
They had to pay a large bill because they didn't use electricity economically
=>They didn't use electricity economically,.....................................................