1. Thanks/ letter. I/ pleased/ hear that you have/ enjoyable Christmas vacation.

=> Thanks for your letter. I'm pleased to hear that you have an enjoyable Christmas vacation.

2. I/ receive/ first semester report/ last week.

=> I received my first  semester report last week .

3. I / get /good grades/Math.

=> I got  good grades // for Math.

4. My teacher /tell / improve History.

=> My teacher told  me // to  improve History. 

5. It / almost Tet. / I / going/  Hue/celebrate the festival/my parents/ bus/ next week.

=> It is almost Tet. I am going to Hue  // to celebrate the festival with my parents by bus next week.

Nhớ cho mình 5* nha :)