Every time he had a chance,he would talk about the great difficulty he had in the new country.
Carbon dioxide ___ from burning fuels is the most common of the so-called greenhouse gases.
Father finally came back home, which I ___ forward it.
Information has been put forward ___ more middle school graduates will be admitted into universities.
Determination is a kind of basic quality and this is ___ it takes to do jobs well.
We have the most population in the world, and most of it _______ farmers.