. —Where have you been all day?—I _______ some former classmates and I couldn’t get back until it was dark.
Noise is unpleasant, ________ when you are trying to sleep.
It's quite warm here; we ________ turn the heating on yet.
Sarah made ______ to the airport just in time to catch her plane this morning.
—Would you mind if I sit here? — _________. It is for Mr. Brown.
Now more and more workers ______their free time trying to improve themselves at school or college.