Complete the sentences. my mother is a teacher. she works ... at ... . (... значит пропуск слова)

Original sentence: My mother is a teacher. She works ... at.. .

Missed words: 1) hard; 2) school.

We write that words, because:

1) how does she work at school - hard;

2) Where does she work - school.

Complete sentence: My mother is a teacher. She works hard at school.