1. The boy did the work on his own. (同义句)
    The boy did the work _______ _______.
2. Nature reserve can provide food and shelter for wildlife. (同义句)
    Nature reserve can provide _______ _______ food and shelter.
3. She didn't come to the party because of the heavy rain. (对划线部分提问)
    ________ _______ she come to the party?
4. The box weighs 100 kilograms. (对划线部分提问)
    _______ _______ does the box weigh?
5. What are they doing now? (用this time yesterday替换时间状语)
    What _______ they _______ this time yesterday?