______ the teacher has given permission, ______allowed to use the equipment in the lab.
We already have ______ pencils, but we need two ______ pens.
“I suppose you _____ that report yet?” “I finished it yesterday, as a matter of fact.”
By all _______, you must try every _______ to help him.
I tried to phone her, but even as I _____ she was leaving the building.
In fact, _______ one cause that leads to the problem.