—Do you know when your friend ___? --I’m not sure. I will tell you when he _____?
I don’t know the man _______ is looking after the old woman.
--____ you come to my birthday party tomorrow, Robert? --I’m afraid not. I have to study for my exam.
Parents will ______ more and more money on their children’s education.
Our English teacher is often _______ to give a talk on English study. He is popular.
_______ the novel, the hero disappeared again.