The pull of gravity depends upon size, _______, upon mass. An object, whether its mass is big or small on the earth, ________in weightless conditions, like the outer space.[ ]

She made me promise not to ________ where it was hidden.

What do you think of ____________ 2014 Nanjing Youth Olympic Games- I should say it was ________ success.

·______down the radio ______ the baby’sasleep in the next room．

abian Nights _____ well known allover the world, in which many a story_____ interesting and instructive．