When I try to find ______that prevent so many people from taking part in the program, it seems to me that there are two main causes.
--- Can you guess if they _______ to play basketball with us? --- I think they'll come if they _________ free.
---Where does he come from ? --- Pardon? --- I asked where_________. A…. did he come from B. he came from
She wondered __________.
---Do you know ________? --- I'm not sure. Maybe he is a businessman.
He is a friend ______ can help you in time of need.