实验室欲配制84g质量分数为10%的碳酸氢钠溶液用于实验，请计算：

—________?

—Father's Day is coming. I'd like to buy a present for my father.

根据中文意思完成句子。
____ 课间，你们最好去室外散散步。
__________go out for a walk during the break.
____ 在日常生活中，向雷锋学习对我们来说是有益的。
____________learn from Lei Feng in our daily life.
____ 我刚才看到他们正在操场上跑步。
I ____________________on the playground just now.
____ 玛丽检查得很仔细，在考试中她没犯任何错误。
Mary checked so carefully __________________________in the test.
____ 恐怕这场大雨将迫使他们把运动会推迟到下周。
I’m afraid that _______________________________.