- Someone is knocking at the door. - It ______ be Tom. He is still in the school.
.I bought _______ exercise books with ________ money.
The harder you study, __________grades you’ll get.
---Do you mind _________your room? ---No, I’ll do that after finishing _________this article.
There used _______ a bus station in front of the building.
He worked late ______ eleven o’clock yesterday.