Astronauts in a spaceship have to _______weightless conditions _______are quite different from ______are on the earth. 

. Emergency line operators must always ________calm and make sure that they get all the information they need to send help.

The US first lady Michelle Obama gave speeches in Beijing University, which      Chinese students’ heated discussions about going abroad for further study. 

 People’s attitudes towards gift giving may         from country to country.

The central finance has handed out 6.3 billion Yuan to help local governments ease capital shortages ____ the snow disaster.