Experiments of this kind __________ in both the U. S. and Europe well before the Second World War started.
—What do you think of our plan? —It will certainly ______; it is a great idea.
. Short skirts ______a few years ago, but they have come back again.
.-–It’s almost eight, but Tom hasn’t turned up. He may not be here. -–He will. He never _____on his words.
. So many people wanted to go to the game that another train had to be ______.