Giúp kịnhhjj

Dưới đây là các câu đã được chỉnh sửa với động từ đúng và hoàn thành bằng "for" hoặc "since": 1. Arte's **worked** in this hotel **since** January. 2. I haven't **seen** the general manager **for** several days. 3. It's a long day today. I've **been** at the reception desk **since** seven o'clock this morning. 4. Peter's **spent** time helping the conference team **since** he came to Madrid. 5. Ken hasn't **written** a letter **for** ages. 6. They've **taught** us important things **since** we arrived here. 7. The guests **haven't had** their room serviced **since** yesterday. 8. He's **served** guests in the Harbour Restaurant **for** four years. Nếu bạn cần thêm sự trợ giúp nào khác, hãy cho tôi biết!