八仙在蓬莱岛久别重逢，见面时每两人握一次手，共握了____次手。
—Look! It's raining heavily. _______ take a raincoat with you?
—Well, I'll take one right now.
Liz ____ (draw) some picture for the people of Bird world when she met them.
下列代数式中，符合书写规则的是（ ）
