Điền từ thích hợp vào chỗ trống

1. this is my pen
=> This pen..........................................
2. My sister is an English teacher. She works at Tien Duong secondary school.(and)
=>.................................................................................................................................
3. Recycle your notebooks, you will save more trees.
=> If ............................................................................................................
4. I liked Tom and Jerry very much. I watched it many times. (so)
=> .......................................................