--How many boys _______ in your group?--Four.
— I have trouble ______ my new computer.— Don’t worry. I will show you ______.
It’s dark. I would rather ______in bed than ______a walk outside.
My dream is to be a singer one day and I will do what I can do __________ my dream .
— Why do you think ______? — He could ______ for exercise.
— ______ his bike is lost? — He has to go to school on foot.