—I’ve got an “A” in the examination. —That’s a good ______. You will surely win a second.
I have two grammars, ______are of great use.
That is not the way ______I do it.
He is working hard, ______will make him pass the final exam.
The reason ______he didn't come was ______he was ill.
This machine, ______for many years, is still working perfectly.