When Wenchuan county was _________ from the outside world, the government sent food there by helicopter.
Life is like riding a bicycle. ________ your balance, you must keep moving.
________ all the homework assigned by the school, the students have to work at it till midnight.
With a great weight ________ off her mind, she passed all the tests successfully.
________ an astronaut into space in 2003, China became the third country to send a woman into space in June, 2012.
________ themselves, the employees in this company usually have a coffee or tea during their break time.