Carbon dioxide ___ from burning fuels is the most common of the so-called greenhouse gases.
All his friends tried their best to persuade him not to more work because of his poor health.
Albert Einstein wasto leave his homelandpolitical reasons during the Second World War.
Now that he is a grade two student, I’m afraid the book is difficult for him to read.
When I looked at him, I myself many years ago.
They have discussed for several years of drafting a new law to control the pollution, but when it will be is still unknown