There are 61 million “left-behind children” in central and western China, the adults have to seek jobs in the cities.
The explorer got a disease in blood for the of fresh vegetables and fruit.
To achieve your goal,yourself and your direction the most important thing.
Scientists ______ thousands of chemicals before they decided on the right one in the end.
What Mr. White said sounds ______ .
It's obvious that the experiment ______ a great success.