字母'b'在'banana'这个单词的开头。

The letter ___b is at the beginning of the word 'banana'.

这首歌的第一个音符是B。

The first note of this song is ___B.

虽然她努力学习，但考试只得了B。

Despite studying hard, she only got a ___B on the exam.

元素周期表上，B代表硼元素。

On the periodic table, ___B stands for the element boron.