làm các câu 2

Here are the completed sentences: **Exercise 3:** 15. I **have not gone** to a zoo before. It is a nice feeling to go somewhere you never **have been** before. 16. Over the past few years, Viet Nam **has become** one of the most popular destinations for foreign visitors in Southeast Asia. 17. I **have not slept** well just lately. I don't know how to keep balance between work and play. 18. As an avid traveler, I **have traveled** to more than 30 countries and 4 continents up to now. **Exercise 4:** 1. People **built** this school in 2001. 2. Last year, my father **promised** to buy my sister a piano. 3. It **was** very hot last summer. 4. I **walked** home after the party last night. 5. The Chinese **invented** printing. 6. Sam and I **played** tennis yesterday. He was much better than I was, so he **won** easily. 7. My grandpa **died** 30 years ago. 8. - You **went** to the movies last night? - Yes, but it **was** a mistake. The movie **was** awful. 9. When I **got** home last night, I **was** very tired, so I **went** straight to bed. 10. Diane **used** to travel a lot. These days she doesn't take many trips. 11. - When Joe and Carol **met** each other? They first **met** when they **were** in high school. 12. When Sarah **got** to the party last night, Eric had already gone home. 13. I **rang** you up two days ago but I **got** no answer. Where **were** you? 14. When I **was** small, I often **played** with a doll. **Exercise 5:** 1. When I was waiting for the bus, I **saw** my close friend. 2. She **has studied** English since she **was** four years old. 3. He **saw** 10 mice when he **came** into the room. 4. When I was going to the door, the phone **rang**. 5. His health has improved since he **returned** from the hills. 6. It is the first time he **has driven** a car. 7. " **Did** you **find** the key which you **lost** yesterday?" "Yes. I **found** it in the pocket of my other coat." 8. Sarah has lost her passport again. It is the second time this **has happened**. 9. When the alarm rang, Jack **jumped** out of bed quickly. 10. Yesterday, I **decided** to stop eating animal products to be a vegan. 11. It **was** my birthday last Sunday, so we **met** up with my friends for a pizza. 12. She **has been** unwell since last week. She **has gone** to the hospital three times. 13. I **have lost** my appetite for sugary food recently. Now I can only eat food with no sugar. 14. They **have switched** to having one low-calorie meal for a few months. 15. My brother **has not written** his report yet. 16. This is the best book she **has read**.