Although human evolution has _______ in the past 10,000 years, we are changing our environment faster still.

—Sarah, you seem to be a little absent-minded. What’s wrong?—Oh, sorry. Actually, I       of the family party this weekend. I have to make a list of what needs to be bought.

The new secretary is supposed to report to the manager as soon as she ________.

--- Is Tom still smoking?--- No. By next Saturday he _____ for a whole month without smoking a single cigarette.

I _____ his telephone number. Had I known it, I would have rung him up.