把下列句子合并成含有賓語從句的句子
He wants to go back to England.Tom says.

She will leave a message on Mr Wu's desk.She says.
They traveled by train last time.i hear
She can't come today.i think
where is the headmaster?i want to know it.
he can't work out this difficult math problem.i think
the students of class one work hard.the teacher said to us
the earth is bigger than the moon.the boy said to us
the diver said to them.people here like to take buses