When hearing the good news, both the child and the mother ______ very happy

Mr. Li is a kind-hearted man. Though he is not rich, he always does everything he can __________the homeless children.

This means that, unless you say ________, no one can perform a piece written by you or make copies of it without your permission.

_____ some mammals came to live in the sea is not known[ ]

He told us whether _________