timid

她的儿子是个羞怯的小男孩，总是避开人群。

Her son is a ___timid little boy who avoids crowds.

加兰德先生用他安静、胆怯的声音再次问汤姆。

Mr Garland asked Tom again in his quiet, ___timid voice.

他是个胆小的小男孩，常常躲在母亲身后。

He is a ___timid little boy, often hiding behind his mother.