#Stop that.
That'll do (now).
No more of that.
Stop everything,please.
I've had enough of that,thank you.
#Settle down.
Take it easy,everyone.
Don't keep fidgeting/mucking about.
Let's hope there are no more interruptions.
#Behave yourselves!
Stop messing/fooling around.
No more fooling/clowning/mucking/messing about.
Don't waste time.
Don't push/shove.
#Don't disturb the others,please.
Don't disturb/keep interrupting your neighbour.
No cheating.
Work on your own/by yourself.
Please ask me if you have any questions/problems(rather than your neighbour).
#What are you doing?
What's going on at the back of the class?
Get down from there immediately!
Ajchara,what are you doing out of your seat?
Ajchara 3EN 051