ACCORDING TO THE AUTHOR,HAVING PLENTY OF SLEEP WHEN WE ARE YOUNGA-IS...

4, - 9 DE HSG ANH 12 CHON LOC CO KEY
9 DE HSG ANH 12 CHON LOC CO KEY
4,According to the author,having plenty of sleep when we are younga-is wasting our timẹ b-can help us regain our strength.c-may cause loss of health. d-can reduce our vigour.