Read the passage about introducing vietnamese custom to foreigners, and then choose the word or phrase among a, b, c, d that best fits the blank in the following passage

read the passage about introducing vietnamese custom to foreigners, and then choose the word or phrase among a, b, c, d that best fits the blank in the following passage
   The vietnamese are known to be polite, hospitable and sensitive. they have a casual and friendly(1)_______.They regard friendship as being very important throughout one's life.They are always open to vistis from friend. Drop-in visits are welcom. The vietnamese are very(2)___________to their family