根据句意,用括号内所给单词的适当形式填空。
His father looked______ (angry)at his son. Because he often makes mistakes.
Next Sunday will be my brother’s __________ ( nine ) birthday.
The children are very happy. They can’t hide their_________(excite)
_______ (luck), he found his lost pen just now.
The swallow flies to_________ (north) countries in summer every year.
Some people think learning English is________ (use).That’s wrong.