They hand down the custom from generation to generation to keep their ______ of life alive.

Some countries are increasing their use of natural gas, and other forms of __________. 

一Do you think I should apply for the job?一Why not? If you make an effort，the _______ are that you’11 be employed．

Mind your ____, and thank your friend when you leave the party.

It is a spectacular __________ as the fireworks are set off and light up the who sky during the Spring Festival.