In most cases, no. However, if the imported merchandise is later exported, the importer can ask for some refund via a drawback claim.

Not all the time. You have to meet a certain value threshold for your commercial shipments. In the US, customs bonds are required for shipments valued over US$2,500. 

In the US, it depends on what type of customs bonds you choose. Single customs bonds are only available for one-time use. Continuous customs bonds remain effective for a year. After which, it automatically renews unless you or any authorized party terminates it.