There is no ______in pushing children unless they are talented and they enjoy it.
We’ll carry the work through , cost _______ it may .
Persist to the end , _______ you are the only one left.
He always talks _______ he had been to outer space.
You’d better come back earlier _______ it is getting colder.
He was walking along the sands _______ he saw a big foot-print in the sand .A. while B. when D. as D. after