用所给单词的适当形式填空．
To our joy，Tu Youyou，a Chinese woman scientist，won the Nobel Prize in her （eighty）．
When Li Ming （return） to his hometown last year，he visited his old head teacher．
She wants to become a famous （sing） when she grows up．
I didn't watch TV last night， because my TV set was （break）．
May I use （you） mobile phone，please？I left my phone at home．