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1.This is a bad and out-of-date custom that should ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡(abolish). 

´ð°¸be abolished

2.Due to her bad health,she has decided ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡(resign) from her position. 

´ð°¸to resign

3.I managed to complete the project with their ¡¡¡¡¡¡¡¡¡¡¡¡¡¡(assist). 

´ð°¸assistance