根据句意及所给首字母,写出句中所缺单词
1.Mary began to learn the violin at the a__of ten .
2.when i grow up i want to do w___i want to do .
3."where are you going to work?" "i'm not s___yet.maybe london or new york."
4.we are goging to help tourists w___can't speak mandarin.
5.he t__part in the 14th Chopin International Piano Competition in Warsaw last week.