Make marks _______ you have questions. 

--- What did your parents think about your decision?--- They always let me do _______ I think I should. 

You should try to get a good night sleep____ much work you have to do.

This machine, ______for many years, is still working perfectly. 

Fisherman Wang Bingzhong from Changli county,Herbei province,examines his boat on May 25 after it was damaged in ________he described as a pirate attack.