Rewrite the sentences:

Rewrite the sentences:
1. Nam spends three days finishing this book.
-> It takes 
2. My sisters spent two years to improve her English 
-> It took
3. It takes one hour to fly from HN to HCM
-> Hoa spends
4. It took us one hour to cook dinner.
-> We spent 
5. Hoa was late because of her tiredness.
-> Because
6. He gets bad mark because of his laziness.
-> Because