（2011·四川成都外国语学校9月考）While income worry is _______ rather common problem of the aged, loneliness is another problem that ________ aged parents may face.。来源:学|科|网]

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

（2011·四川成都外国语学校9月考）The project _________ by the end of 2011, will expand the city’s telephone network to cover 2000000 users.

A．being accomplished　　　　　　 B．accomplished

C．to be accomplished　　　　 　　　 D．having been accomplished

（2011·四川成都外国语学校9月考）Living in the dormitory means　　 to take care of yourself, understand each others ' differences and share　　 interests.

A. to learn, common.　　　　　　　　 B. learning, ordinary

C. to learn, ordinary　　 　　　　　　 D. learning, common

（2011·四川成都外国语学校9月考）25．Barack Obama has taken personal blame ________ the security failures which led ________ the attempt to blow up a plane on Christmas Day.

A. of; to                    B. for; to                         C. on; on                      D. in; on

假如你是某外国语学校高三学生李华。近来，你发现很多同学课间休息时间坐在教室里学习。请你根据以下提示，用英语写信给校长反映这一问题，并呼吁同学们注意学习效率。
1. 反映问题；
2. 你的看法；
3. 你的建议(至少两点)。
注意：
1. 词数100-120；
2. 文中不得提及人名、校名及地名；
3. 信的开头已为你写好（不计入总词数）。
Dear Sir,
I am Li Hua, a senior 3 student in your school. I’m writing to tell you about a problem. __________________________________________________________________________________