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____ red is a symbol of warmth, it can sometimes make people feel uneasy or even frightened.

______ has recently been done to improve the conditions of elementary schools, a great number of children are unable to go to school.

As the visiting prime minister puts, China’s influence in the world will continue to strengthen ______ its economy grows.  

____ he was not rich enough to buy whatever he wanted, Edison decided to make his new laboratory the best.

—I like your new leather boots!
—Thanks．I had to try on almost a dozen pairs ______ I decided to get them．

----You seem to have known Dr Smith for a long time.
---- That’s true. ______ he joined our club six years ago.

Stand over there, ___ you’ll be able to see the oil painting better.

His letter was so confusing that I could hardly make any ______ of it.

______ the Internet is of great help, I don’t think it’s a good idea to spend too much time on it.

I didn’t realize my mistake ________ my teacher had a face­to­face talk with me.