I. Hãy lựa chọn câu trả lời đúng nhất để hoàn thành câu sau ở thì hiện tại hoàn thành.
1. John _________ around the world. 
2. I __________ “Iron Man” several times. 
3. It is the most interesting book that I _________ ever _________. 
4. This is the first time I _________ a public speech. 
5. Jonh _________ in that house for 20 years. 
6. He __________ her since she was a little girl. 
7. I _________ already __________ the answer. 
8. _________ you _________ this article yet? 
9. I _________ just _________ lunch. 
10. He _________ recently __________ a new theory on maths. 
11. _________ you ever _________ abroad? 
12. It _________ in the past week. 
13. I _________ chocolate since I was a child. 
14. She __________ a cold for a week. 
15. I _________ my keys. 
