The number of private cars in urban areas should be limited ___________the number of public buses should be increased.
The boy has to learn ________ things that he hardly has time for play.
I will never forget the hours we spent ____ English books in the library.
Though he is_______, he never feels_______.
If this dictionary is not yours, ______ can it be?
With fewer and fewer farmers _______ chickens, the price of eggs in the market ________.