—How often does your brother go swimming?—________.
–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.
---Who can tell me_______? ---Every 15 minutes.
---Few young people in China know about Lady Gaga , _______? ---_______, she is quite famous here in China.
–Look! A man is cutting a tree on the moon. --It ______ be true. The teacher said there is no air on the moon.
All of us went to the park ______ Bob. He had to look after his sister.