----- _________ do you see your grandmother ?      ------ Once a month.

The music made me think of the __________ of a running stream.

---What’s Mother doing, Jim?---I don’t know. She ________Zhou Libo’s show at her bedroom.

Internet is ________ used by people, especially by young people.

When I was young,I always read books at night.Which of the following is correct for the underlined word in the sentence?