Complete the following patterns by identifying the rule and filling in the boxes.

Here are the completed patterns:

a) The pattern increases by 2 each time.

$$2, 4, 6, 8, \boxed{10}, \boxed{12}, \boxed{14}, \boxed{16}, \boxed{18}, \boxed{20}$$

b) The pattern decreases by 10 each time.

$$50, 40, \boxed{30}, \boxed{20}, \boxed{10}$$

c) The pattern increases by 5 each time.

$$5, 10, 15, 20, \boxed{25}, \boxed{30}, \boxed{35}, \boxed{40}, \boxed{45}, \boxed{50}$$

d) The pattern increases by 1 each time.

$$28, 29, 30, 31, \boxed{32}, \boxed{33}, \boxed{34}, \boxed{35}, \boxed{36}, \boxed{37}$$