help!!!!!! which language is better for me????

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hello everyone, I am a new comer of mylot. I find it is a great place. Now i have something important to ask. I am a Chinese college student. next year, i have a optional moduel to choose. i will choose a second language to study. there are Germany, Spanish, France and Japanese. I do not know which one is the most useful for me, and it is difficult for me to choose from. so can you help me to explain these languages and give some advice about it? OK? thanks very much!