Computer is so useful. It can do almost everything.—Yes, but it ______ what to do.

Charles Darwin considered ______ to be the process by which evolution took place.

____is known to us all is that the 2008 Olympic Games will take place in Beijing.

It’s high time that he settled down in the city and ____ a new life.

There are 51 students in Class Three, _____ failed in the test.