Please take your tea otherwise it'll be cold.
I looked at him, similing.
Don't speak while taking your meal.
Please take your tea, otherwise it'll be cold.
Very good! But I added a comma.
I looked at him, smiling.
Perfect again! Nice sentence... I read your sentence, smiling.
Don't speak while EATING your meal.
You don't TAKE meals, you EAT them.
Very good English!