EX23: Điền giới từ phù hợp sau động từ. Chỗ nào không cần giới từ thì đánh dấu X 1. The school provides all its students …. books. 2. A strange thing happened .... me a few days ago. 3. Mark decided to give up sport so that he could concentrate .... his studies. 4. I don't believe .... working very hard. It's not worth it. 5. My present job isn't wonderful, but I prefer it .... what I did before. 6. I hope you succeed .... getting what you want. 7. As I was coming out the room, I collided ....somebody who was coming in. 8. There was an awful noise as the car crashed .... a tree. 9. Patrick is a photographer. He specializes .... sports photography. 10. Do you spend much money .... clothes?