group - groups

fluent - more fluent

make - making

has to - have to

although - since

paint - painting

north - northern 

riding - to ride

much - more

boring - bored 

If the festival didn't cost too much money, we would hold the festival.

While the tortoise was running, the hare was sleeping.

Although the girl worked hard, her stepmother wasn't happy.

The Buffalo-fighting Festival took place in Do Son last Saturday because there were so many people.

Lang Lieu couldn't buy any special food because he was very poor.

During Tet, Vietnamese people buy all kinds of sweet, so they make Chung cake as well.

The Hung Kinh Temple Festival was a local festival. However, it has become a public holiday in Viet Nam since 2007.

At the Mid-Autumn festival, kids can sing, dance, and enjoy mooncakes. Therefore, every child likes it very much.

VI/

1.If the festival didn't cost too much money, we would hold it.
2. While the tortoise was running, the hare was sleeping.
3.Although the girl worked hard, her stepmother wasn't happy.
4. There were so many people because the Buffalo-fighting Festival took place in Do Son last Sunday.
5. Lang Lieu couldn't buy any special food because he was very poor.
6. During Tet, Vietnamese people buy all kinds of sweets, so they make Chung cakes as well. 
7. The Hung King Temple Festival was a local festival, however, it has become a public holiday in Viet Nam since 2007.
8. At the Mid-Autumn Festival, kids can sing, dance, and enjoy moon-cakes, therefore, every child likes it very much.