The task is challenging and demanding. Who do you think can make it? — _______ my partner have a try? I think she is the right person to do it.

My brother and some of his classmates ______ as volunteers to help the elderly in the old-age home during the winter holiday to come.

Have you heard the latest news?-No, what ____?

Each button, when ____, provides a piece of beautiful music.

Scientists are convinced ___________ the positive effect of laughter ___________ physical and mental health.