--Who is the old man talking with your teacher? ---I don’t know. I him before.
However, at times this balance in nature is disturbed, _______ a number of possibly unforeseen effects.
He just _______ the headlines because he was too busy to read the whole newspaper.
The new technology has opened up a very wide _______ of possibilities.
_______ the new medicine for a year and we’ll see how well it works.
----How is everything, Magarret? ----________.