1.Tet is the most important festival in Viet Nam. Most Vietnanese return home for Tet
=>……Tet is the most important festival in Vietnam; therefore, most Vietnamese return home for Tet ...........................................................… ( using therefore).
2. You are Vietnamese, you should know the story of chung cakes.
=> If........you are Vietnamese, you should know the story of Chung cakes.............................................................
3. All the students love the principal. He is very kind.( using because)
=>...........All the students love the principal because he is very kind.....................................................................
4. Mr Lam was very busy; however, he spent the whole day at the La Mat Village festival.
=> Although.......Mr Lam was very busy, he spent the whole day at the La Mat Village festival...............................................................
5. He likes to listen to pop music than to watch TV after school.
=> He prefers....listening to pop music to watching TV after school.......................................................................