Mr. Wang is ill, so we must ____ a new teacher to the school to take his place.
Not until I began to work ______how much time I had wasted.
Not until the early years of the 19th century______ what heat is.
_____ he realized it was too late to return home.
So little _____ agree on the plan that they could not settle their difference.
We were lucky enough, for no sooner _____ home _____ it rained.