Dear (điền tên bạn muốn nhé), 

I've just come back from a nice and long trip to Singapore. My first impression about this country is its cleanness. There isn't any trash on the road and at public places, this probably because of the strict rules at here. I came to many interesting places such as Marina Bay, Gardens by the Bay, and Singapore Zoo. I went their with my friends and live in low-cost hostels. Will you come with me next time.

Hope your answer soon.

Your best friend,

(tên của bạn)

Dear.....

I went camping with some friends from my English class. We went to a village near the sea. We had three tents for seven people. Luckily one tent was quite big. The place was very pretty, but the weather was not very good. It was cloudy on several days and sometimes it rained. But we had a good time in spite of the weather. We did some walking and on two days we went diving with a local club. It was very exciting. There was an old ship under the water that we could explore.
Was your holiday good? Write soon.
Love
........