Раскройте скобки, употребляя глаголы в одном из след.времен: Past Simple? Present Simple, Present Continuous или Past Continuous
4. Who (to speak) there? - I (not to know).
5. He (not to smoke). He (not to smoke) now. When he (to be) at the office yesterday, he (not to smoke), he (to work) hard.

4. Who is speaking there? — I don't know.5. He doesn't smoke. He is not smoking now. When he was at the office yesterday, he didn't smoke, he was working hard.

Who is speaking there? I dont knowHe doesnt smoke.He is smoking now.When he was at the office yesterday,he didnt smoke,he was working hard.