— Tom, are you going swimming with us?— I’d love to, but something important has ______.

______ there are living creatures in the outer space as those on Earth hasn’t been proved so far.

-- London Bus Service, how can I help you?--- Hi, I’d like to rent a bus which can ____ 40 people for our trip to Cambridge.

Liu Xiang found himself      by reporters and his fans on his arrival at the airport.

Living with a host family while studying abroad, in which there may be some other college students, __________ you the chance to learn more about the new culture.