I am afraid he's more of a talker than a doer, which is __________ he never finishes anything.
Coming into the room, I found them ______ at the table, _____ chess.
If you ______ go, at least wait until the rain stops.
I ______ her, but I never could.
— Anything new in the new regulations(规则)? — They will ______ to us all.
We don’t doubt _____ he will succeed in the research work.