单项选择题
A．Don't worry too much. You can do it later. B．Take it easy. You didn't have to work so hard. C．Take time off and let it be. D．Take it or leave it. You don't have to do it.
A．No. no. It's quite all right. B．Well. never mind. C．It won't bother me. D．Of course not.
A．He's twenty. B．He's much better. C．He's a doctor. D．He's David.