It wasn’t a few years _________we met each other.
________ doesn’t seem to have been much difficulty in solving the problem.
How many of us ______ a meeting that is not important to us would be interested in the discussion?
If you don’t wait _______ the red light, you will be punished by the policeman.
There was ____time ______I hated to go to school .
---- There is a lot of smoke coming out of the teaching-building there.---- Really? It _____ be a fire, most probably.