Underlined the mistake and correct the mistake in each following sentences

II. Underlined the mistake and correct the mistake in each following sentences
1. He often play sports or games along his friends at recess                                    
2. Nam is the most intelligent of the twins
3. My sister has a five-months-old daughter
4. In the future we will have fewer work and more money to spend
5. Let's getting some of these vegetables
6. My mother added a few salt to the spinach so it tasted good
7. You had better running if you want to catch the bus
8. Staying at home all day sounds bored to me
9. My brother prefera history than literature
10. She looked very happily when I told her the news