___ happens, we’ll carry on the experiment.

I was surprised by his words ,which made me recognized ______silly mistakes I had made . 

 Paul was not allowed to work        he was fully recovered from the flu. 

Russia’s cutting off the gas supply raised a major concern to the European Union, ______ a number of member states are increasingly dependent on one single supplier.

_____ is known to all is that effective measures should be taken to deal with the problem of the over-exploiting of our resources.