根据句意，用括号内所给单词的适当形式填空。
When the superstar ____________(出现) at the party, everyone got very excited.
Flying across the Atlantic for the first time was a great ________ (成就).
Learning the correct _______________(发音) will help you learn English better.
________ (无论何时) I see the birds, I’ll dream of flying in the sky.