When and where this took place _____ still unknown.
—Is there any possible way to help them get rid of such a bad habit?—To tell the truth, it’s very hard. But we ________ on this problem, trying to improve the situation .
We give dogs time, space and love we can spare, and ________, dogs give us their all.
It is a long time ________ they separated, but it won’t be long ________ they meet again.
Only when I checked the paper once more _________ there was a mistake.
Bob insisted that he ________ nothing wrong and ________ from work.