按要求变化下列各句。
1. She walked so slowly that she missed the last bus. (改为并列句)
She walked _____ slowly ____ catch up with the last bus.
2. I forgot everything. So did Tom. (改为同义句)
____ Jim ____ I couldn't ____ everything.
3. Have you visited the Great Wall? Cold you tell me?
Could you tell me ____ you ___ visited the Great Wall?
4. Work hard, or you'll fall behind others. (改为同义句)
____ you ____ work hard, you will fall behind others.
5. The math problem is too difficult for him to work out. (改为复合句)
The math problem is ____ difficult ____ he can't work out.