_______blood if you can and many lives will be saved.
When the clock_________ twelve, all the lights went out.
The man pulled out a gold watch, ______ were made of small diamonds.
Though I am improving in my study, I still have a long way to go _____some of my classmates.
No one hopes the two countries will be at ________ war, because ______ peace is what everyone wants.
---- Hello, John. I haven’t seen you since we were at university.---- ________. It’s been a long time.