1．They had to travel into the town to trade (做……的买卖) the product from their farm.
2．The earth was here long before the origin (起源) of the human species.
3．The passage pointed out that all the countries united (联合) to fight global recession.
4．This kind of apple is more expensive because they are imported (进口) from abroad.
5．The Rio Grande marks (标志着) the border between Mexico and the USA.
6．Do something relaxing (使人放松的) before going to bed — read a book, or take a hot bath.
7．African people were fighting for the freedom and independence of their countries.
8．The seeds are transported by the wind.
9．We gathered for the celebration of her birthday.
10．Your habit of smoking should be abolished.
