Ответ:
1) his pullover is darker than his jeans
2) this exercise is more boring than that one
3) George is funnier than Robert.
4) my exam results are better than before
5) Tom is more selfish than David
6) you look thinner. Have you lost weight?
7) London is more busy than Glasgow
8) Football is more popular than handball
9) George runs faster than J
10) The traffic is a lot badder after five o'clock
11) Exercise 16 is easiest than exercise 15
12) Russia is larger than the UK