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5 mike and steve have just gone the library

1 Who has just gone the library?
2 With whom has Mike just gone the library?
3 When have Mike and Steve gone the library?
4 Where have Mike and Steve just gone?
5 Have Mike and Steve just gone the library?
на крайняк:
Has Mike or Steve  just gone the library?
Mike and Steve have just gone the library, haven't they?