Как будет на 11: 50 2: 10 7: 45 9: 00 8: 15 1 : 15 12: 00 1: 35 5: 30 7: 55

when do their office hours begin?

is mr.bell busy all day?

their office hours don't begin at 9 o’clock.

mr.bell is not busy all day.

waste     to waste

protection     to protect

destraction     to destroy

pollution     to pollute

damage     to damage

damage     damaging

environment     environmental

harm     harmfull

danger     dangerous

safety     safe