--Do you know _____ this dictionary belongs to ?--Let me see. Oh, it’s _____.
---______ a small plane in the future? ---Yes, I think so.
Tony gets up very late in the morning, ______ he is often late for school.
What will you be like ______?
I think there won’t be ______ schools in the future.
I think he will come back ______ three days.