It was not until the beginning of the meeting _____ he realized _____ I told him was the only possible way to deal with the problem.

It was wrong to cut down the old tree which dates back to 1915, _______ the reason．

          you are aware of the trick used in advertisements ,I don’t think you are eager to buy.

They will send kids to college      it takes, even if that means a huge amount of debt.

_____________grades you get in this exam, you should never lose heart.

Exciting as its special effects are ______, there is too much violence in the film.

How can they learn anything _____ they spend all their spare time watching television?

______you have got a chance, you might as well make full use of it.

----What’s that smell?
---- I don’t know, but ______ it is, it’s terrible!

In May 2011, Americans spent 53 billion minutes on Facebook, ______ it the most popular U.S. website.