How much cheaper do you think a flat in the countryside is than ______ in the downtown?
________ for knowledge is very strong.
I think Bob , ______Peter, are to blame for the accident .
It is no use ______ to persuade him _______ smoking because he has been addicted to it.
Eager to play computer games, the little boy pretended __________ his homework .
Studies shows that people are more __________ to suffer from back problems if they always sit before computer screens for long hours.