III Choose the right variant.
I ______ by 10 o’clock yesterday.
had returned              b) returned              c)have returned
She _______ never ______ the song before the concert.
have...heard              b) was....hearing              c)had...heard
What ____ she________ before the film began?
had...translated              b) was....translating              c) did... translated
He had written three invitation letters when I ______
had come                     b) came                        c) was coming
It _______  snowing by 8 o’clock.
had finished                    b) finished                        c) was finishing
By 5 o’clock the rain had stopped and they _______ to the park.
had gone                    b) have gone                        c) went
I _______ the newspaper by 6 o’clock.
 read                    b) had read                        c) was reading
The students ___________ the room by that time.
have cleaned                    b) had cleaned                        c) cleaned
Her mother had cut the pie before I ______
have phoned                   b) phoned                        c) was phoning