When I (walk) ... into the room, everyone (work) ... .
walked, was working
Tommy (watch) ... a film when he (hear) ... the noise.
was watching, heard
When the whistle (blow) ... , I (run) ... .
blew, was running
My dog (nap) ... when I (come) ... home.
was napping, came
When you (arrive) ... at the party, who (be) ... there?
arrived, were
They (sleep) ... peacefully until the alarm (ring) ... .
were sleeping, rang
While I (study) ... , my friends (play) ... .
was studying, were playing
We (clean) ... the house all morning.
were cleaning
What (they/do) ... at 10pm last night? It was really noisy.
were they doing
I (not bother) ... her because she (read) ... a book.
didn't bother, was reading
I (study) ... for the test all night.
was studying
You (eat) ... that sandwich for an hour!
were eating
Everyone at the cafe (enjoy) ... their coffee, then the stranger (appear) ... .
was enjoying, appeared
When I (leave) ... the house, the sun (shine) ... brightly.
left, was shining
I (phone) ... you four times last night. Where were you?
phoned
I (sit) ... in a cafe when you (call) ... .
was sitting, called
Why (you, stand) ... on a chair when I (come) ... into the room?
were you standing, came
We (play) ... tennis when John (hurt) ... his ankle.
were playing, hurt