178. There are four basic _____ of blood in the human body. What do you belong to, A, B, AB or O?
All the guests were dancing and singing when suddenly the light _________.
Do you think it necessary that we have all the chairs_________?
________do you think _________ the monitor of our class?
.We were about to go downstairs when the lights_________.
.Jack couldn’t answer the question_________ got the money.