By the middle of the 21st century , the vast majority of the world’s population ________ in cities rather than in the country.
The purpose of Internet is not to make life more difficult,but _____it easier.
into English, the sentence was found to have an entirely different word order .
the shark drawing closer to her,the clumsy swimmer was ____almost to death.
The construction of the two new railway linesby now.
to their own work ,most of the parents spend little time with their children.