Choose the correct alternatives to complete the sentences.

Here are the completed sentences with the correct alternatives: 1. As I *was walking* back garden. 2. I *did* my homework when I *heard* the news. 3. The witness *wrote* notes *about* the events while the detective *investigated*. 4. They *had* lunch in a café and *went* to the office. 5. They *went* into the room when the teacher *came*.