Complete the following sentences using the words and expressions from the word and phrase list. try to think of as many variants as possible:

1) customs wars are waged between different countries so as to …
2) customs tariffs serve to …
3) it is only natural that in war- time customs inspections are more…
4) customs houses are set up to …
5) to declare an item is to …
6) the opposite of reducing customs tariffs is to …