Some person ____ calling for you at the gate.
It is said that there are millions of camels in India and _______ of them is growing.
It was on a cold winter evening_______ his father left home and was never back.
We don’t need to do extra work this evening. The day’s work was almost ______ now.
--The button in the kitchen is out of order.--_______.
The heart is believed to _____blood into veins(血管) which are netted all over the body, thus keeping a person alive.