Dien vao moi o trong voi gioi tu thich hop (in , at, on)
1. We don't go to school on Saturday and Sunday
2. Today we have math at 9 o'clock
3. We have geography on Tuesday and Thursday
Dien vao moi o trong voi gioi tu thich hop (in , at, on)
1. We don't go to school ____on______ Saturday and Sunday
2. Today we have math ____at_____ 9 o'clock
3. We have geography ___on______ Tuesday and Thursday