实验室用98%的浓硫酸和蒸馏水配制稀硫酸．

（1）将100克98%的浓硫酸配成19.6%的稀硫酸，需要加____ 　g蒸馏水进行稀释．

（2）量取和混匀操作中需要的玻璃仪器包括量筒、胶头滴管、玻璃棒和____ 

（3）若量取水时俯视读数，其他操作均正确，则配出的稀硫酸的浓度比19.6%____ 

与999相邻的两个数是（  ）

根据短文内容，完成下列各小题。

    It's four thirty in the afternoon. There are many students on the playground. Jim and his friends are playing basketball. Li Lei and other boys are playing football. Miss Gao is watching the games. She is looking after the clothes, too. Where are the girls? They are over there. Some are running, others are jumping. The twins are on duty today. They are in the classroom. Lucy is cleaning the window, Lily is sweeping the floor. They are working hard. They are tired(疲倦的) but happy.