_____ all the students in this class have in common is _____ they have a high object in life .

There is no doubt _____ a high-speed maglev train is very good, but I doubt _____ it will do harm to
 the environment.

A big earthquake struck southem Haiti, knocking down buildings and power lines and causing _____ its
ambassador to the United States called a catastrophe.

He tried his best to solve the problem, _____ difficult it was .

It was _____ he said _____ made me happy.

It was with great joy _____ we received the news that the oil prices had been reduced.

We _____ walk in the moonlight, talking about _____ we were interested in.

We don't doubt______ he can do a good job of it.

_____ scientist have found recently is that skinny genes can explain why some people are always thin.

Now that their parents are dead, the poor boy doesn't know ______ the money they left.