don't talk until you _(tell) to.the meeting _(hold)in the school hall _(host) by our headmaster yesterday evening

don't talk until you _(tell) to.the meeting _(hold)in the school hall _(host) by our headmaster yesterday evening
don't talk until you _(tell) to.
the meeting _(hold)in the school hall _(host) by our headmaster yesterday evening

don't talk until you _(tell) to.the meeting _(hold)in the school hall _(host) by our headmaster yesterday evening
don't talk until you are told_(tell) to.
用被动语态

are told

被动语态表达 “ 被告知”

are told 表被动，被告知
held
was hosted

为你解答。
Don't talk until you (are told) to.
句意：你被告知要交谈时才交谈。
解释：not ... until，直到……才。
动词tell要用被动语态形式，被别人告诉。

第二题：The meeting (held) in the school hall (was hosted) by our headmast...

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为你解答。
Don't talk until you (are told) to.
句意：你被告知要交谈时才交谈。
解释：not ... until，直到……才。
动词tell要用被动语态形式，被别人告诉。

第二题：The meeting (held) in the school hall (was hosted) by our headmaster yesterday evening.
句意：昨天晚上在学校礼堂举行的会议是由我们的校长主持的。
解释：两个空都是过去时态的被动语态，但第一空不是句子，只填过去分词。

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