— Have you ever visited the Opera House?
—Yes．When I was in Sydney, I ______ it twice．

—Though it         in the desert most of the year, people still live there.
—That’s the case. They say east or west home is the best.

—Have you been to the United States?
—Yes, only once. I ________ there only for seven days.

China ________ rapid economic development and political stability over the past three decades, but with them ________ some social problems.

—Though it __________ in the desert most of the year, people still live there.
—That’s the case. They say east or west home is the best.

— How long have you been here?
— Only about five minutes. Henry and Simon ______ here with me.

Who did the English teacher, as well as the monitor, _________ an article for the wall newspaper?.

-- Has your elder brother returned from Africa yet?
-- Yes, but he _________ here for only three days before his company sent him to Australia.

In fact, more and more people ________ to live a greener, healthier and more environmentally “green life”.

When and where to build the new factory ____yet.