From Twitter
Jo: I ① a video yesterday from an man in Italy; it was smart.
Mo: Yeah; what'd ya ②?
Jo: He warned us.
Mo: Us?
Jo: Everyone, Mo!
Mo: What'd he ③?
Jo: Protect ourselves. He ④: use phones less outside. The virus can fall on 'em. Don't meet friends. Care.
Choices:
said
watched
see
say
saw
日本語訳
ジョー:昨日イタリアの男性の動画を①見たんだ。賢い内容だったよ。
モー:そう。何を②見たの?
ジョー:僕たちに警告してたんだ。
モー:僕たち?
ジョー:みんなにだよ、モー!
モー:彼は何と③言ったの?
ジョー:自分の身を守れって。外では携帯電話を使いすぎるな、ウイルスが付くかもしれない、友達と会うな、気をつけろって④言っていた。
選択肢:said/watched/see/say/saw。
解答・解説
Answers And Explanations:① Jo: I [saw] a video yesterday from an man in Italy; it was smart.
'Watched' would work, but we say 'saw' (especially with movies in the theater--that is not the case here), to indicate, I think,* the happenstance of the situation.
② Mo: Yeah; what'd ya [see]? 'See' is the only option here.
Jo: He warned us.
Mo: Us?
Jo: Everyone, Mo!
② Mo: What'd he [say]? 'Say' is the only option here.
Jo: Protect ourselves.
③ He [said]: use phones less outside. 'Said' is the only option here.
The virus can fall on 'em. Don't meet friends. Care.
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*I say 'think' because this is a case of dominant dialect and style, not grammar. There is no rule about it. It just sounds better and carries a nuance of brevity.

① saw、② see、③ say、④ said。①の watched も文法上は使えますが、原文の筆者は saw のほうがこの会話では自然だと感じています。これは厳密な文法規則ではなく、話し方の好みやニュアンスだと注記しています。原文の解答欄で②・③の番号が重複しています。感染に関する会話は当時の発言の訳です。