When ，____your father ____back? When he _________ back, please give me a ring.

Where ______________? – An art exhibition. I think it’s really worth _______ and we can learn a lot from it.

There is ____ “u” and _____ “s” in ____ word “useful”.

Where is your grandpa now? — He ______ newspaper in the living room.

My little cousin enjoys ________ picture books before he goes to bed.