The Sydney Opera House, which _________ almost 900 rooms and halls of different sizes, is definitely at the top of our list when we travel to Australia.
—Ken has gone to the Africa country to work as a volunteer. — I would rather he _____there. The situation there is very tense.
What the children in the mountain village need ______ good books.
In front of our school ______, where a lot of people play or take exercise at any time.
His study in Peking University lasted four years, ______ he founded his own company in Hong Kong.
I just don’t understand _______ that prevents so many Americans from being as happy as one might expect.