David often helps Sandy _______ her Maths, he also shares his school things _______ her.
We flew to _______ Hong Kong. But _______ plane was late.
The flight _______ us _______ hour yesterday.
He is from _______ US and he speaks _______ English.
We arrived ________ the Beijing Railyway Station at 11:00 am.
Tom hurt one of his _______ yesterday.