I think you should end it _______ it’s too late, or you may be sorry about it later

_____ in the library regulations that any book borrowed be returned by due time, or the borrower will be fined．

They are walking down the way _______ there are manytrees on ______side.

All of them can take this job , but I want to know who is _______.

The brave soldier was willing to risk______ his life rather than ________ in to the enemy.