=>
1. The tickets are very expensive. However, there are many people buying them/the tickets.
-> however : tuy nhiên
2. Tet is the greatest festival in Vietnam. Therefore, Vietnamese people love Tet.
-> therefore : vì thế, cho nên
3. Children wear their new clothes on the first day of Tet. Moreover, they can can also receive lucky money.
-> moreover : hơn thế nữa, ngoài ra
4. Children like Mid-Autumn Festival very much because they can sing, dance, and eat moon cakes.
-> because : bởi vì
5. Although she isn't a Buddhist, she eats as a vegetarian.
-> although S V : mặc dù
6. She wants to enjoy the Tomatoes Festival in Spain when she is at the age of 20.
-> when : khi