13. The lake near our house is ... a picture. *
prittier as
as pretty as
as pritty
14. When my grandmother was young, winters were a lot ... *
colder
more cold
cold
15. The cave near our city is ... than the cave in the north of the country. *
deeper than
as deep
deeper as
13 as pretty as
14 colder
15 deeper (than в тексте уже стоит)