It was with the help of the localguide the mountain climber was rescued

They will start their project, ________at helping the poor children to be educated in the west of China. [ ]

Knowing what colors look good _______ your skin is of great importance when you buy clothes.

Tom, you need to go to bed immediately____ you are only six years old and can’t stay up late[ ]

Do you know Lin Shuhao—Yes， he is famous________ playing basketball ________a basketball star.