lll.
15.People in Viet Nam are very friendly and warm-hearted.
16.Nha Trang attract lots of tourists because it has beautiful beaches.
17.Travelling by plane is more exensive than travel by train.
18.My brother bought 2 tickets for the table tennis match yesterday.
lV.
19.The weather was good, so we decided to go out.
20.Ho Chi Minh city is the most crowded city in Vietnam
21.Although my sister loves comedy, she doesn't have time to watch it.