___________do people greet visitors? Some shake hands. Some say "hello" or "hi".Some kiss.( )
A.WhyB.WhatC.How
He go to bed until he his homework.
—I don’t know when ______ tomorrow.—I will call you as soon as he ______.
——Excuse me. Is it my turn now?——Not yet. Please wait on the chair ______your name is called.
I was surfing the Internet my brother was doing his homework.
She has studied in this school she was seven years old.