More highways have been built in China, _____ it much easier for people to travel from one place to another.

As we know, penicillin became the greatest drug of the 20th century, ______ millions of lives.

        in a university in the USA, Chinese students must have excellent speaking and writing abilities in English.

______ money , it remains to be seen whether we can put the idea into practice.

________ with routine office tasks, she had no time to attend to her children.