Here are the suggested words to fill in the blanks:

(1) **habits**
(2) **before**
(3) **sign**
(4) **get**
(5) **empty**

So the completed passage would read:

"Each country has its own special traditions and customs just as individuals have their own (1) **habits** and daily routines. Many people find it difficult to get used to the customs of another country (2) **before** they go abroad. For example, in some Asian countries, people do not usually finish everything on their plates, because it is a (3) **sign** that they have not had enough to eat. Visitors from the West find it difficult to (4) **get** used to this, because they usually eat everything up to show that they liked it. When an Asian host sees their (5) **empty** plates, he usually assumes that they want more."