________ energy is generated from natural resources—such as sunlight, wind, rain, tides and so on.
Jack,s room always has the dusty smell of an apartment whose windows are __________ opened.
Unluckily, the poor girl got a(an) __________ disease, which even doctors couldn't name.
Finally the English government tried in the early twentieth century to form the UK by getting Ireland __________ in the same peaceful way.
The bridge built ten years ago __________ the island __________ the mainland.
The bus __________ passengers outside the airport.