请把文件平放在桌子上。

Please ___lay the documents flat on the table.

学校明确规定学生必须穿校服。

The school ___laid down the rule that students must wear uniforms.

我们打算储存几箱好酒等孩子们结婚时喝。

We plan to ___lay in several cases of fine wine for our children's weddings.