Perfect Tenses

Many people ..... tried but no-one has succeeded so far.

That programme is so boring that it's like watching paint ......

By the end of this year I realize I ..... writing tests for three years now.

Do you mind ..... the door as I find it very hot in here?

I honestly think that the time ..... come when we should celebrate our success.

How anyone ..... to live in those conditions in the 18th century is difficult to imagine.

..... ever heard of this writer before?

That stupid dog ..... all day long.

They were eating dinner when the lights ..... out.

No-one ..... believe your story when you tell them.