3×0.3×0.3=0.9×0.3=0.27（立方米）
答：它的体积是0.27立方米。
—Which is more useful, reading or writing?
—I think _______ of them are useful.
唤____ 脾____ 拆____ 训____ 吵____
换____ 牌____ 折____ 驯____ 抄____
缕____ 凋____ 飘____ 覆____
楼____ 调____ 漂____ 复____
—How many times _______ you _______ to Beijing this year?
—Three times.
