I could tell he was surprised from the _____ on his face.

The dentist gave me a shot which took ________ almost immediately and I didn't feel a thing.

One of the main __________ of the summit was “sustainable development”,or the question how we can continue developing the world without damaging the environment.

After two hours of hard fighting,the northern army won the ________.

—Do you think she’s going to leave? —The ____had crossed my mind.