Bantu please kak Help me

The answer :
3. Lily (spilt) coffee on her lap while she (was sitting) in a cafe
4. While Beth (was standing) in an elevator, she (sent) a text message on her cell phone
5. David (ran into) an old friend while he (was standing) in an elevator
6. Lily (dropped) her glasses while she (was standing) in an elevator
7. Beth (avoided) a shark while she (was swimming) in the ocean
8. While David (was swimming) in the ocean, he (saw) a dolphin
9. While Lily (was swimming) in the ocean, she (found) a shipwreck