Mike often exercises ______ half an hour in the morning.
--They are making too much here. I can’t do anything.--I will tell them to keep quiet .
--Why don’t you read this book?--It’s not necessary to read this book .There isn’t useful in it .
--I don’t think teenagers should be allowed to smoke.-- .
You should really _______ smoking. It’s a terrible habit.
Sixteen-year-olds shouldn’t ______ to go to an Internet bar.