The Postal Service announced Tuesday it had made a significant _______in getting machinces to read handwriting .

We must keep on learning if we want to keep up with the     of the changing times.

We decided not to climb that mountain because it was raining_________.

At the meeting they discussed three different _______ to the study of radioactive waste.

I can’t say which type of tea tastes better. It’s just a（an） ______ of personal preference.