When my sister phoned me, I could not hear clearly what she was _____

下列各组词语中，加点字的注音全都正确的一组是

My mother often_______ after supper with my sister .

_____ about the future of these wild animals, people set up conservation areas to protect them, especially the _____ species.

What time do we have to be at the gate?—_______ passengers start to board the plane.