The doctor often tells him _____________ more exercise.
The girl under the tree is new here , so ___ people know her .
I often watch them ___ the piano .
— Will you buy the white watch or the red one ?___ I’ll take ___ .One is for my mother and the other is for my sister .
I am good at math , but his English is ___ than mine .
Speak louder ,please ! I can ___ hear you .