They were surprised that a child should work out the problem _____ they themselves couldn’t.
The city was difficult ________, _________ was defended by an army of 6,000 men.
---- Could you do me a favour and take the box up to the six floor? ---- ______. No problem at all.
How did you manage to get to school on time ______ you missed the school bus?
In no case ______ allowed to go on.
He left Europe _____ World war II broke out.