The lion is considered the king of the forest as it is a(n) _____ of courage and power.
They work well together-her steadiness(稳健) acts as a(n) to his clever but often impractical ideas.
Ever since their quarrel, there has been an unpleasant in the office.
Having checked the doors were closed, and _____ all the nights were off , the woman opened the door to her bedroom.
In this experiment, they are wakened several times during the night, and asked to report what they _____.
— I _ it as a must of a student that he should say hello to his teachers first whenever they meet. — I can’t agree more.