We went to the beach last Sunday, and we had great fun _____ volleyball.
She looks very sad. I want to help her, but I just don’t know ____ to do it.
---How will students study in the future? - -- ____home______ computers.
Xiao Shenyang says that _________ job is to make people happy.
I hope we can fly to _________ moon one day.
— What did Paul say last night?— He said _________ listening to the radio program—“Teen Talk”.