In time of serious accidents, _______ we know some basic things about first aid,we can save lives.
We offered him our congratulations ____ his passing the college entrance exams.
He will come ____ you ask him.
I made the coat ____ my own hands. It was made ____ hand, not with a machine.
Everything around us is ____ solid ..liquid ____ gas.
It is late; ____, I'm too tired to go out.