Suitable prepositions

When John and his mother arrived at the clinic, they saw a lot of patients wating
in reception

I have got this answer because of example 4
please look for the right answer

1.
[C usually singular 一般用單數] a particular type of welcome for someone, or a particular type of reaction to their ideas, work etc 接待﹐歡迎; 接納﹐承認

If you spoke their language you ' d get a friendlier reception . 假如你能講他們的語言﹐你就會受到更友好的接待。

Vaughan ' s play met with a mixed reception from the critics . 評論家對沃恩的劇作褒貶不一。

2.
[C] a large formal party to celebrate an event or to welcome someone 歡迎會﹐招待會

a wedding reception 婚宴

A champagne reception will be held in honour of the ambassador ' s visit . 為歡迎大使來訪將舉行香檳酒招待會。

3.
[U] the desk or office where visitors arriving in a hotel or large organization go first 〔旅店﹑大機構的〕接待處

Please leave your key at the reception desk . 請將你的鑰匙留在接待處。

4.
BrE -the area around or in front of this desk or office; LOBBY(1) 【英】前廳

I ' ll wait for you in reception . 我在前廳等你。

5.
[U] the quality of radio or television signals that you receive 〔收音機﹑電視機的〕接收性能﹐收聽[收視]質量

listeners complaining about poor reception 抱怨收聽質量太差的聽眾

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When John and his mother arrived at the clinic, they saw a lot of patients wating
in reception

When John and his mother arrived at the clinic, they saw a lot of patients wating
on reception

Andy!!