I used to say 把手放下 手放下 for some reason 放下手 seems uncomfortable, though the grammar is certainly correct.

Lyn，标准说法应该是“把手放下”，请研究下中文“把”的用法，比如“把枪放下”、“把钱交出来”，“把衣服穿上”。 如果你用英文语序“放下枪、交出钱，穿上衣服”也是对的，但经常不这么说。

"把手放下", but it sounds weird since I dont see why the other kids would continue having their hands raised when someone has been picked to answer lol

HAHA！ It's so easy you can say "放下手"，But I think that when you choice a studuet answer your quistion,other kids will put their hands by theirself

呵呵，把手放下