Past Perfect or Past Perfect Continuous?

Front

I ______ (work) all day, so I didn't want to go out.

Back

had been working

Front

When I arrived at the cinema, the film ______ (start).

Back

had started

Front

After they ______ (eat) the shellfish, they began to feel sick.

Back

had eaten

Front

She ______ (sleep) for ten hours when I woke her up.

Back

had been sleeping

Front

We were late for the plane because we ______ (forget) our passports.

Back

had forgotten

Front

They ______ (live) in Beijing for three years when he lost his job.

Back

had been living

Front

When we met, you ______ (work) at that company for six months.

Back

had been working

Front

Julie didn't arrive until after I ______ (leave).

Back

had left

Front

When we ______ (finish) dinner, we went out.

Back

had finished

Front

We ______ (eat) all day, so we felt a bit ill.

Back

had been eating