There is a clock _______ the wall and windows are _____ the wall.
— Excuse me. Is the library open all day? —. Only from 8 a.m. to 4 p.m..
Keep off the drugs(毒品), you and your family will be in great danger?
— May I come in? I'm sorry I am late. — Come in, please. But could you please tell me ?
Jane is one of the students in the class have ever been to China.
“Don't to strangers on your way to and from school”, mother often to me.