The islands developed on their own for 80 million years and ________ have many rare animals found nowhere else.

Don’t play with the knife, ______ you’ll cut your hand. —Sorry, I ______ .

When will you tell him the news? —I’ll tell him about it if he ________ back. [ ]

Excuse me, do you have the time? —_______.

do you fly to Japan to see your son?—Once a year.[ ]