Remember the beginnigs of these sentences, if necessary look though the text again. 1. ... never saw a dodo
2. ... which means '' finished,,
3. ... died many years ago
4. ... the last one died in 1914
5. ... both made from wood
6. ... and to produce much of the oxygen in the air
7. ... new ones like AIDS
8. ... we will never find the cure
9. ... a lot of other creatures and plants need growing space too​

P. cont используется: 
1) для действия, которое было в процессе (ну, длилось некоторое время) в определенное время в
at 9 o'clock  last night we were watching tv. 
2) для времени, которое было в процессе, когда другое действие прервало  продолжительное.  действие в процессе продолжительное,   действие, которое прервало -- в простом
she was cooking dinner  when the doorbell rang. 
3) для нескольких действий, которые происходили в одно и то же время в
David were reading the newspaper while Sara was watching TV.

Lake Quoich (Scotland, UK) - renowned for its quite a large lake monster. Lake LeMond (Scotland, UK) - the habitat of the animal as two drops of water similar to Nessie. Loch Loki (Scotland, UK) - here, according to old legends, live lizard-like monster with locals greater fame and okitaomote. Lake Moran (Scotland, UK) - almost a copy of the above-described reservoirs with the "typical" history and legends about Nessie.  Lake Scheele (Scotland, UK), according to contemporary witnesses, still lives by a large lake monster resembling the ancient plesiosaur.