My sister is only four years old, but she can look after ________ now.

My English is so poor, please help________ to improve it..

—Do you know the man wearing a pair of glasses?—Yes. He’s a teacher of ________. He teaches ________ History.

Good morning, class. Today ____ are going to learn a new unit, Unit 12.

Is this       ruler?No,      is over there(在那边).