.Everyone knows that _______ is dangerous to play with fire, but _______ is difficult is to prevent children from playing with fire.

What an unforgettable experience! I’ll write it down _______ it is still fresh in my memory.

Pudong Developmental Zone is no longer ________ it used to be.

George Washington was born in 1732 in a rich family in _______ is now the state of Virginia. 

One of the men held the view ____ the book said was right.

The problem with being a time waster is _____the online game playing often spills over into the periods of time that should be productive.

Tom said he did not mind what time I arrived at his place____I promised to go and help him.

There were some seats left over _____every delegate had sat down.

It is difficult for us to learn a lesson in life_________we’ve actually had that lesson.

There were some chairs left over____ everyone had sat down.