The new lecture course differs from the old one, ________ the students aren't required to attend lectures.
I wonder why he didn't do it as _____.
—What made Mary so sad? —_____ three tickets to the music concert.
—Do you think it's going to rain over the weekend? —_____ .
—I'll be away on a business trip. Would you mind looking after my cat? —Not at all. _____ .
I will never forget the days _____ we spent together in the country. I will never forget the days _____ we worked together in the country.