Though ________ in a big city Jim always prefers to paint the primitive(原始的)scenes of country life.
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.
____, he would have passed the exam.