He managed to become a great inventor ___ he left school at 16.
Don’t ________about things so much.It will make you stressed out.
My parents often about my health.
If Iyou , I’d wear a shirt and tie.
Don’t laugh ___ others.You should help them when they are in trouble. A.at B.to C.of
Sixteen-years-olds shouldn’t ______ to go to an Internet bar.