They are living with their parents for the moment because their own house _______. (2012.四川II)
Astronauts in a spaceship have to _______weightless conditions _______are quite different from ______are on the earth.
— Can you answer my question? --Sorry, I____________ . Would you repeat that question?
Mary has lived in China for 3 years, so she ______ to the life here.
There was plenty of time. She ________ .
-----________ he be watching TV now? ------Yes, he ________ be watching TV now.