根据解释写出下列单词（英语高手进）

根据解释写出下列单词（英语高手进）
根据解释写出下列单词:例如a life-giving gas fond in air答案oxygen
1.ask questions
2.let out
3.say what someting is likk
4.put someone in a flat positon
5.accepted warmly
6.say loudly
7.the front area in a big office or a hotel
8.a bell that warns people about fires
9.the outside part of something
10.can't be seem
11.join
12.words that make something clear
13.an invisible from of energy
14.partly
15.put...under the ground
16.something that covers you in bed
17.place where something is
18.let someone do sth
19.an exciting thing that happens