task 4: điền gới từ thích hợp vào chỗ trống
1. the read or study..............the same time.
2. we enjoy all............. or classes.
3. ..............school we study many things.
4. ..............history, we study past end present events..............Vietnam and.................. the world.
5. ...............phisics, we learn.............how things work.
6. she learns how to use a computer .............her computer science class
7. newspapers are...............the racks..............the middle.