From the _____ look on his face,I know he has failed in the exam. [ ]

Which _______ your brother________, apples or bananas?

下列各项，全都是李白的作品的一项是（ ）

UK Prime Minister Cameron has become the first world leader ______ to fly onboard Air Force One with US Prsident Obama.

The explorers were told to ________ themselves with everything they would need for the voyage.