Which of the processes listed would be the most satisfactory method to use to lower the humidity of the air being circulated by an air conditioning system?（）
Large pipes or （） are fitted between the steam and water drums to ensure good natural circulation of water.
When the girl began to sneeze continuously,________
A heater in the circuit facilitates warning of the engine prior to （） by circulating hot water.
Large pipes or down-comers are fitted between the steam drum and （） to ensure good natural circulation of water.
Hardly（）home when it began to rain.
By the 6th century BC, athletes began to specialize ______ particular sports, and even began to hire coaches.
No sooner had I got home _____ it began to rain.
No sooner had I got home _____ it began to rain.
Beginning in the 1970s, the practice of trick-or-treating went into a sharp decline after unsubstantiated rumors spread about homeowners distributing poisoned Halloween candy to children.
4. Hardly ____ when it began to rain.
She her face in her hands and began to sob.
______ graduation, he began to live on his own.
The author began to misbehave______.
_____ I was studying there, I began to learn skiing.（)
My grandmother's hair began to ~ last year.
It was nearly lunch time _____ Henry began to feel bad.
No sooner had the rain stopped______the spectators began to return to the field.
_______me Europeans began to learn how to use the compass on their ships.
She was so angry that she began to shout.
_____the children to bed, she began to correct the students’ exercises.
The reason why the writer's car began to move from side to side is ______.
Recent border confrontations between the two military groups lend credence to the rumors of an impending war.
Aja began her own library in the house next to her home
