1) It is cold. - Faz frio.
2) He is going to arrive in a moment. - Ele vai chegar num momento.
3) I am here on business. - Estou aqui a negócios.
4) It is hot. - Está quente.
5) Do you like coffee with milk? - O senhor gosta do café com leite?
6) I take my coffee with milk. - Eu tomo o meu café com leite.
7) Do you know him well? - O senhor o conhece bem?
8) I only talked with him about business. - Eu só falei com ele sobre negócios.
9) I only know him a little and I don’t know his wife. - Eu só o conheço um pouco e não conheço a esposa dele.
10) It’s already four o’clock. - Já são cuatro horas.
11) He told me that we have to talk about busniess. - Ele me disse que nós temos que conversar sobre negócios.
12) Now I understand what happened. - Agora entendo o que aconteceu.

3. de negocios.
10. quatro horas.

Sabio, they are using "sobre negocios" in the lesson. I checked that several times because my automatic inclination was to use "de negocios" since that is what you would say in Spanish. Oh well. In a later lesson the term "business trip" comes up and that is "viagem de negocios".

sobre negocios would work.