Bài 2: Choose the correct answer ( chọn đáp án đúng để khoanh) 1. They built/have built this house last year. 2. A: Hello B: Hi mum, it's me. I just want to say that I arrived/have arrived safely. 3. I had/have had a problem for months, but I didn't find/haven't found a solution yet. 4. Liz was/has been ill for 2 weeks. She's in hospital now. 5. This is the first time I made/have made a birthday cake. 6. What countries did you visit/have you visited in Africa? 7. My great grandmother went/has been to Vietnam twice. 8. I lost/have lost my keys yesterday. It's terrible! 9. I'm sorry, my boss isn't here now. He was/has been on vacation. 10. David walked/has walked in the rain all morning. He's sick.