I prefer __________ at home to __________ outside.

A．to stay；playing                           B．to play；play

C．staying；play                             D．staying；playing

The old man began to learn to drive a car at the age of __________.

            A．fifty               B．the fiftieth       C．fifty years old D．fifties

— How nice the skirt is! How much is it?

— It __________ me ?500.

　　　 　　A．spent 　　　　　　 B．cost　 　　　 C．bought　 　　　 D．paid

— __________ do you send an e-mail to your cousin?

— Sometimes．

　　　　 　 A．How long　　　　 B．How much　　　 C．How often 　　 D．How soon

__________ mothers both work in the same hospital.

A．Tim and Peter’s                             B．Tim’s and Peter 

C．Tim’s and Peter’s                           D．Tim and Peter

The woman __________ will give us a talk tomorrow is a successful doctor.

A．who                B．whose                    C．which                     D．whom

— __________ we finish our homework at once?

— No, you __________.

A．Can；don’t     B．Must；needn’t        C．Must；mustn’t       D．May；can’t

I hear that he will be back __________ two weeks’ time.

            A．at                    B． in                         C．after                       D．for

What ____ useful dictionary! And _____ dictionary is bought in Tianhe Bookstore.

            A．an；a              B．a；a                C．a；the               D．an；the

最近，网友自发发起旨在倡导厉行节约，反对浪费的“光盘行动”（clear the plate），引起众多媒体和网友的热烈反响。请根据以下信息，以“My opinion on clearing the plate”为题谈谈自己对这一问题的认识和看法。

注意：1、词数：80—100；

2、可以适当发挥，以使行文连贯，语言流畅；

3、不可透露学校、个人等任何真实信息。