Do you know the man ________ visited the United States in February?–Yes. He is Chinese Vice-President Xi Jinping. He said it was his ____ visit to the United States.

We don’t have enough nurses to look after the patients. At least _____ are needed.

Nancy quickly ________ the door and put down her school things.

The house ____ Lu xun used to live in is now a museum.

Where ______ the post office?