Twelve-12,11-eleven,13-thirteen,15-fifteen,16-sixteen,17-seventeen,18-eighteen,19-nineteen,20-twenty.
They work at a big plant
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1 more expensive
2 the best
3 faster
4 more friendly
5 cleverer
6 funnier
7 bigger
8 older
9 faster
10 longer
11 more intelligent
12 wiser
13 happier
14 busier
15 more dangerous
16 the narrowest
17 more important
18 the worst
19 the best
20 smaller
21 faster
22 faster
23 smaller
24 the brightest
25 cleaner
26 the tallest
27 the best
28 older
29 heavier
30 faster
When I saw him yesterday, he was speaking to his teacher