Помогите, кто знает. Нужно выбрать правильный вариант.

1. A check is a written order to a bank to pay a certain amount of
money to the person or business to who/whom the check is
made.
2. This is the executive to who/whom the expert explained how to
accomplish the task.
3. It would also include individuals in junior managerial or profes-
sional jobs, many of who/whom could expect to earn
considerably more as their career progressed.
4. If you know that your grandmother, who/whom loves rye bread,
is coming to visit you, you might want to get some for her.
5. The customers who/whom buy this “loss leader” can decide to
buy a few other things they need.