Only when

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    1. She wasn’t allowed to open her gifts until her birthday party. (It was not until)

    2. The police didn’t make any accusations until they had some evidence. (Only when)

    3. She didn’t write to him anything until she received the first letter from him. (Not until)

    4. He hadn’t been a famous singer before he went to the concert. (It was not until)

    5. The boy didn’t tell the reality until his father threatened to punish him. (Not until)