The dog ____attacked passers-by and therefore was kept on a chain by the owner.

You can nevertouch this machine when it ________, it is very dangerous

Sunday today, and I_______ up very early —So you really had agood rest

I didn’t know this years ago ,but recent science ____that inharmonic marital(婚姻的) life like quarrels or fights harms one’ heart

__put everything back than the phone rang