Future Perfect Continuous Tense

They will ___ waiting for ten minutes when the train arrives.

Sara will have ___ for four years before she gets a diploma.

Before he publishes his book, he ___ working on it for a whole year.

We ___ been waiting for two hours when the concert starts.

The kids ___ playing football for fifteen minutes when their coach comes.

In September I'll ___ working at my company for nineteen years.

Will you have ___ studying at the university for three years when you are twenty-one?

Will ___ watching the film for two hours before they have dinner?

What ___ doing for one hour before your friends come?

At six o'clock we'll have been___ her for twenty-five minutes.

When he ___ twenty, he ___ football for ten years.

We ___ working in the garden for many hours, so in the evening we ___ to relax.