Какая часть отсутствует в сложных словах: - child, - day, -friend, -house, -teacher?

i have been to paris. i was there two months ago. i visited louvre and versaille. i saw eiffel tower and went to champs elysees.

foreign languages are necessary for everybody in modern society. it helps us to make friends from other countries and communicate with them without any problems,it helps us in travelling,in using the internet resources for getting more information.speaking foreign language helps us to earn more money.

we all have to learn ,to do our best in learning languages as it helps to be more successful