Seven-letter words - change zero to two letters to make a new word (Part 1)

Thread Games
1

Since the earlier iteration was shut down for having over 10k posts. The last word in the old thread was

beanery

2

beaners

3

meander

4

derange

5

dearest

6

arrests

7

attests

8

retests

9

restate

10

estates

11

statist

12

stating

13

slating

14

plastic

15

elastic

16

spastic

17

drastic

18

plastic

19

clastic

20

elastic