We should do what we can ___ the endangered animals.----Yes,it’s our duty them.
— When should I ask her?— The sooner ___________.
Terry told me that they planned to set off _________ Tuesday morning.
When I met her in Italy, she _____________ a photo of the tower of Pisa.
— Do you want to eat out, ________ would you rather stay at home?— It’s up to you.
He can’t ___________ the difference between right and wrong.