a) it becomes more difficult to learn new languages
b) the sounds of another language
c) learning a second language
d) when they speak it
e) you have to memorize
f) as well as their native language

Young children can learn a new language very easily. If they are
surrounded by people speaking a different language, they soon learn to
speak it _____________(1). Children who mastered two languages in this
way are called simultaneous bilinguals though even in this case one
language can be considered as the main one dominating over the other.
But as people grow older, ________________(2). People gradually lose
the ability to learn the grammar and pronounce (3). People who learn a
new language as adults often have a «foreign accent» ________________
(4).
просто напишите число и букву.