This is ____ sister.
Nowadays, children under 1.4 meters _______________ be free to take buses in some cities.
There are a lot of trees on _______________ sides of Century Avenue in Pudong.
The football player felf extremely _______________ after they won the game.
The professor has given us _______________ advice on how to improve our memory.
I knocked on the door several times but _______________ answered, so I left.