Here are the completed tasks as per your requirements:

### I. Make a complete letter:
Dear [Friend's Name],

I arrived in Hanoi at 5 o'clock yesterday morning. I am staying in a nice hotel not far from the city center. I have already seen Uncle Ho's Mausoleum and some other places of interest here. Tomorrow, I am going on a trip to Halong Bay. I have never been there before, and I'm excited about the trip; I could hardly sleep!

I will be home on Sunday, November 10th. I will tell you more about my trip when I am in Hue. I hope you are well.

Best regards,
[Your Name]

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### II. Write correct sentences to make a complete letter:
Dear Mary,

Thank you very much for inviting me to your birthday party. I am afraid I will not be able to come. I have many things to do this week. I wish I could go to the party. I will offer embroidered jeans as a gift. I hope you like it.

I wish you many happy returns.

Best wishes,
[Your Name]

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### III. Make sentences from the words and phrases provided:
1. I live in Van Phuc village, Bac Ninh province.
2. It is far from town, so life is quiet and peaceful.
3. Every day, I get up early, about 5:30.
4. I clean my teeth, wash my face, have a quick breakfast, and walk to school.
5. It takes half an hour to get there.
6. I usually have lessons in the morning, so I often get home late at 12:30.
7. I study hard at school because I do not have time to study at home.
8. I help my parents with work on the farm in the afternoon.
9. During summer vacation, my parents often let me visit my grandfather in Nha Trang.
10. It is a great time because I spend all my time there going swimming.

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### IV. Write a letter to your pen pal.
Dear [Pen Pal's Name],

I am interested in learning English. I would like information about your institute. I want to improve my reading and writing skills.

Looking forward to your reply.

Best regards,
[Your Name]