Just as a famous Chinese saying goes, a timely heavy snow is a ______ of good harvest next year. 

tomato

My father warned me ________ going to the West Coast because it was crowded with tourists.

 Remember to ______ the pockets before you put those trousers in the washing machine.

— Could you give _______ an introduction to the new machine?— Of course. I will tell you how to use it.