30. _______ 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 |
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The meeting was to have started at nine o’clock, but the chairman had not _____ by ten.
| A．turned up | B．turned down | C．turned out | D．turned off |
We have planted thousands of trees in recent years. This year _____ we’ve planted ten thousand trees.
| A．even | B．just | C．alone | D．only |
It was an exciting moment for these football fans this year, _____ for the first time in years their team won the World Cup.
| A．that | B．while | C．which | D．when |
As director of the company, I can’t _____ three weeks from work.
| A．carry | B．cost | C．pay | D．afford |
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