1. Lan wants to live and work in Japan.
=> on thành in
2. Hung's birthday is on the 2nd of July.
=> on thành in
3. We will arrive in Saigon on 9 a.m.
=> on thành at 
4. This cat jumped on his face and scared me.
=> in thành on
5. It is his birthday in the 22nd.
=> in thành on

1. on-> in
2. of -> on
3. on -> at
4. in -> on
5. in-> on