Source: mostlybrightideas.wordpress.com

Arrange these jumbled words into a good Passive Voice.

1. opened - long - this - can't - be - door - a - time - for.

2. the - should - to cross - children - be - helped - street.

3. party - Paula's - he - not - invited - might - be - to.

4. the - book - this - library - be - must - soon - returned - to.

What is the best arrangement for point 2?