The process of producing electricity may also give out CO2, ______ you heat your house with electricity instead of charcoal.
The article is too long and should be ______ by half .
All the students were looking forward to_______here. A, come B. being coming C. came D.coming
We were all waiting for you; you _____ for the seaside by yourself without leaving a message.
The way he did it is different______ we were used to .
You _____ be tired; you have been working for so long a time, but he _____ be tired; he has just begun to work.