Spanish
The main language spoken in Caracas is Spanish.
Caracas is the capital of Venezuela who's official language and most spoken is Spanish but many other languages are spoken there (some of which are also official languages of Venezuela)
The major language spoken at Hangzhou is Mandarin Chinese.
The major language is English.
The major language spoken in Australia is English.
The main language spoken in Moskau (Moscow in English) is Russian.
English.
English
The major language spoken in China is Standard Mandarin. However, a variety of other languages including English are spoken in China.
Greece's major language is Greek.
The major language of Poland is Polish.The major language of Turkey is Turkish.
Spanish, however English is the defacto language