Playing on a frozen sports field sounds like a lot of fun. Isn’t it rather risky, _______ ?
—How did you like Nick's performance last night? —To be honest, his singingdidn't __________ to me much.
Outside my office window there is a fire __________ on the right.
It's said that a prisoner has escaped __________ the prison.
The bird escaped __________ 、
Human __________ is much more complicated than that of atoms, liquids or planets.