The science of computer, _____rapid progress has been made in recent years, is the most important of all science.
The chair looks rather hard, but in fact, it is very comfortable to .
American Indians about five percent of the US population
We cannot figure out quite a number of insects, birds and animals are dying out.
They decided to turn to can help them out of difficulty.
See the flag on the top of the building. That was we did this morning.