You can only be sure of_____you have at present;you cannot be sure of something you might get in the future.

Human facial expressions differ from those of animals in the degree___they can be controlled on purpose.

At last he chanced to sail back towards the place _____ he had started. 

Eric received training in computer for one year,_______ he found a job in a big company.

I have reached a point in my life ______ I am supposed to make decisions of my own.

－Is there any possibility ______ you could pick me up at the airport?
－No problem.

Later in this chapter cases will be introduced to readers __ consumer complaints have resulted in changes in the law.

We went through a period______communications were very difficult in the rural areas.

As his best friend. I can make accurate guesses about______he will do or think.

There were some chairs left over _____ everyone had sat down.