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.[ ]

_______ attention makes her unhappy.

Do you often get to school _____ bike —Yes. But I sometimes get to school _____ the school bus.

下列文化常识表述中正确的一项是

The new secretary is supposed to report to the manager as soon as she _______