If certain species _____ extinct, an expert in New York, says there would be enough resources to reintroduced them in the future.
______side of the street is lied with different shops,______of which sell electronic products.
— Susan, will you please go and empty the rubbish? — ______?
Only when _____ possible to settle the problem.
They stayed with me three weeks, _____ they drank all the wine I had.
Sometimes we are asked _____ the likely result of an action will be.