__________ that the demand for power continues to rise at the current rate, it will not be long before traditional sources become lacking.
I really can’t decide _____ first. A small computer or a big one?
-----Was the class long enough? -----No, _______ enough.
The government of the country is trying to _____ the prices for foods in order to please people.
Is _____ possible to fly to the moon in a spaceship?
You can’t _____ until tomorrow morning after the blood examination.