He tried his best to solve the problem, _______difficult it was.
He has been working hard day and night, which, of course,his tiredness.
Could I do some explanations? Ito call on you last night, but somebody came to see me just when I was to about leave.
His parents, , didn’t look after him very well—the elbows of his jacket and his boots were badly worn out.
After months of voyage, Columbus arrived inlater proved a new continent.
—Are you satisfied with what he has done? —Not in the least. It couldn’t be.