fruits

completed 係帶有動作, 過程o既意思
如果你話:something is completed=一d野俾人完成
通常呢個係用在被動情況~

而家你用果句Fruits make the day completed
可以分開後面個意思為一句:The day is completed
(e.g. I make you happy, 咁即係話 You are happy)
The day is completed 即係話一日被人完成左, 問題在日子唔可以俾人完成, 日子唔係動作
成句意思為:生果令呢一日被完成

到Fruits make the day complete
complete, 可以解為完美的,完整的
咁後面個意思可以寫成The day is complete=呢一日係 完美的/完整的
全句中文意思為:生果令到呢一日完整

所以廣告冇錯

你誤解係因為 complete 亦係形容詞！

The job is complete（形容詞）與 The job is completed （被動句）意思一樣。

而make後可跟形容詞（He makes me happy）或動詞（I made him go with me），但動詞的話會用present tense（bare infinitive）。如果係被動句，就要講 the day is completed，砌唔埋；用past participle作形容詞complete用，咁明明有個更簡單o既形容詞，點解唔用呢？

Fruits make the day complete
呢句有d問題

呢句----->Fruits make the day completed
冇問題