— Why didn't Luo Ji go with them then? 

— _____ he was too tired.

只有把教育搞上去，才能 （）
①化人口大国为人才强国                         ②增强我国的综合国力   
③从根本上提高中华民族的整体素质          ④在激烈的国际竞争中取得战略主动地位 

许多老科学家、老艺术家在回忆自己的成长经历时，都非常怀念自己的中学时光，认为正是自己在中学阶段养成了认真学习的态度、勤奋钻研的精神、自主学习的习惯，为自己后来发展奠定坚实的基础。这给我们的启示是(       )  

      Lily has a pen friend in America. Her name is Alice. They write to each other every week. They tell each other about their lives. Here is a letter from Lily.

Dear Alice,

    Thank you for your letter and telling me about your best friend. In this letter, I’m going to tell you about my friend. Her name is Cathy. She has long brown hair and blue eyes. She is the same age as me, but a little taller .She is always happy. We sit together in class and help each other with our homework. We always play together after school and play computer games for an hour. Cathy thinks quickly（迅速地） and does better than me. She is learning to play the piano（钢琴）.I am learning to play the piano, too. We play together every day. It’s fun. We always have a good time.

    Please write to me soon.

                                                                                                                                                                                                   Love,

                                                                                                                                                                                                     Lily