英语 句型转换1.you must throw the broken pottery away at once (改为被

英语 句型转换
1.you must throw the broken pottery away at once (改为被动语态）
the broken pottery ___ ___ ___ ___ at once
2.teenagers can learn more knowledge from real life if they have more chances to experience it .(改为同义句）
more knowledge can___ ___ by teenagers from real life if they are given more chances experience it .
3.students can't take magazines out of the reading room without permission(改为被动语态）
magazines can't___ ___ out of the reading room without permission