How long have you been training to be a dancer?

START

When (a)   to be a dancer?

The play only started a couple of minutes ago so we haven't missed much.

JUST

The play (a)   so we haven't missed much.

The ballet company are just finishing a six-months tour.

FOR

The ballet company (a)   six months.

The actors started rehearsing two months ago.

BEEN

The actors (a)   two months.

It's almost a year since I last went to the cinema.

FOR

I (a)   the cinema for almost a year.

I have never seen such a terrible film before.

EVER

This is the worst film (a)   seen.

Tom has never acted in public before.

FIRST

This is the (a)   acted in public.

The theatre was last used a year ago.

FOR

The theatre (a)   a year.

The theatre first became important in ancient times.

SINCE

The theatre (a)   ancient times.