用括号内所给单词的适当形式填空。
1. Soon the poor family received a lot of money and clothes from many ________ (charity).
2. He can do ________ (well) in math than before.
3. Do you know the ________ (mean) of this word?
4. We need time and ________ (free) to relax ourselves.
5. What ________ (happen) in the world in l 00 years?