The process of curing a disease is like a war ___different soldiers fight against an enemy.
| A．as | B．when | C．where | D．while |
The manager urged older staff ____early retirement and new staff _______ more time for work.
| A．take up; to set aside | B．took up; set aside |
| C．would take up; to lay aside | D．must take up; lay aside |
_________ from other continents for millions of years, Australia has many plants and animals not found in any other country in the world.
| A．Being separated | B．Having separated |
| C．Having been separated | D．To be separated |
--What are you going to do this afternoon?
-- I am going to the cinema with some friends. The film _______ quite early, so we __________ to the bookstore after that.
| A．finished; are going | B．finished; go |
| C．finishes; are going | D．finishes; go |
It was a time_______ the killer whales helped the whalers catch the baleen whales.
| A．when | B．that | C．then | D．which |
The most important thing about cotton in history is ______part that it played in _______Industrial Revolution.
| A．∕；∕ | B．the；∕ | C．the; the | D．a; the |