You’ll fail your next exam _______ you work hard at your lessons from now on .A. or B. so C. unless
I was feeling hungry, ______ I bought myself a sandwich.
The2014 Winter Olympics started ______ February7,2014.
Where’s Dad? Mum is looking for ______.
I didn’t know ______ last year.
The city walls _______ forty years ago. What a pity!