.______and ______,they ran out of room.
—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.