词类转换 根据所给词汇，填入一个正确的形式。

1. Edison kept _______ out his new idea.(try)

2. Do you think the computer today is _______ inventions?(useful)

3. I saw a boy ________ on the railway tracks near the station.(play)

4. I want to learn how to run quickly and to eat _______.(health)

5. She speaks too quietly.Tell her ______ a little louder.(speak)

在既有建（构）筑物地基加固与基础托换中常用的地基加固技术主要有以下几种类型：

A．灌浆法

B．排水固结法

C．水泥土搅拌法

D．高压喷射注浆法

E．碎（砂）石桩法