2.It was not until haif past nine that he arrived at the office
3. It was not until 2004 that Mary worked for the UN (chắc là UN vì mình không nhìn rõ lắm )
4. It was not until I was 15 that I knew how to ride a bicycle
5. It was not until last Sunday that John did his homework
6. It was not until I went to university that I liked chocolate
( bài nay dễ mà bạn dựa vào câu bên trên là làm được thôi
)