没有人举手回答这个问题。

Méiyǒu rén jǔshǒu huídá zhège wèntí.

No one raised their hand to answer this question.

请举手表示你同意。

Qǐng jǔshǒu biǎoshì nǐ tóngyì.

Please raise your hand to show that you agree.

有问题就举手。

Yǒu wèntí jiù jǔshǒu.

Raise your hand if you have a question.