On average, these footprints are 14 to 18 inches long, 5 to 9 inches wide and much larger than _______ of a human.
Carbon dioxide from burning fuels is the most common of the so – called greenhouse gases.
Because of the Russian gas limit to Europe, attempts to use botanical fuel as a source of power.
--- Where did you get your laptop? I’d like to get one. --- Well, at shop on Avenue 48, but I can’t say exactly.
In China, car is becoming popular means of transportation.
On Teacher’s Day, we all went to school to see our teachers.