Past simple or continuous

While I __________ (walk) to school, I __________ (see) a stray dog.

• was walking, saw

• was walking, was seeing

She __________ (sleep) when the phone __________ (ring).

• slept, was ringing

• was sleeping, rang

We __________ (watch) TV when the power __________ (go) out.

• watched, was going out

• were watching, went out

He __________ (fall) while he __________ (run) in the park.

• fell, was running

• was falling, ran

I __________ (break) my phone while I __________ (carry) it.

• broke, was carrying

• was breaking, carried

While they __________ (study), the teacher __________ (enter) the classroom.

• studied, was entering

• were studying, entered

He __________ (call) me while I __________ (take) a shower.

• was calling, took

• called, was taking

We __________ (have) dinner when the guests __________ (arrive).

• were having, arrived

• had, were arriving

The baby __________ (cry) when his mother __________ (come) home.

• was crying, came

• cried, was coming

I __________ (not hear) the doorbell because I __________ (sleep).

• didn't hear, slept

• didn't, was sleeping