287. The clear colorless liquid that falls as rain, fills lake and rivers, and is necessary for life to exist is______.
——What about _________ job? ——It’s too difficult _________ job for me.
--Can you finish the writing on time? --_________.
—I’d like a pen which _________ well.—Will this one _________?
—Why not go out for a walk before breakfast? —Oh,yes. _________ is my favorite time of day.
—I failed again. I wish I _________ harder. —But you _________.