问题: 改一下！！！！！改一下！！！急啊！！！！
The language lab should always be kept clean(改为一般疑问句）
We weren't allowed to enter the theater by the guard until the manager came(改为主动语态）
解答:
The language lab should always be kept clean(改为一般疑问句）
Should the language lab always be kept clean?
We weren't allowed to enter the theater by the guard until the manager came(改为主动语态）
The guard didn't allow us to enter the theater until the manager came.
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