Giúp em với

1. While I was walking (walk) along the beach, I found... (find) some money. 2. Rick saw (see) the helicopter as he was swimming (swim) back to the shore. 3. We were talking (talk) to the doctor when we heard (hear) gunshots. 4. As the police were helping (help) the man, they saw (see) blood on the floor. 5. As Mike was getting dressed (get dressed), he remembered (remember) something important. 6. While I was searching (search) for my keys, I found (find) the note. 7. Helen and Rob were watching (watch) TV when they heard (hear) a loud scream. 8. While we were going (go) into town, Max began (begin) to feel ill. 9. The volcano erupted (erupt) as people were climbing (climb) it. 10. Dan asked (ask) the teacher for help while he was doing (do) the math exercises.