How can we remove moisture from glass apparatus?

Which of the following is used as desiccants to remove moisture from organic solvents?

Which is the drying agent used to remove moisture from ammonia ?

Which one of the following is used to remove moisture from ammonia?

The substance used to remove moisture from ammonia is______________

How can we shield some instrument from magnetic field? Can we do it by keeping them inside a wooden box or iron box?