Polar bears live mostly on______ sea ice, which they use as ______platform for hunting seals.
__________ in thought,he almost ran into the car in front of him.
_____to somebody,a British person often shakes hands with the stranger.
Do you consider it any good__________the truck again?
The bad weather meant__________ the rocket launch or 48 hours,.
She was afraid __________ the dog in case it became dangerous.