.The Red Army ____ more than 25,000 li and arrived at North Shanxi at last.
He bought some books, ______ were expensive.
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.