13.Subway Line 4,__________into use in September 2009,has made traveling in Beijing easier.
The ability________an idea is as important as the idea itself.
He________an engineer by an oil company in the Middle East.
Would you like________at the counter or would you prefer a table?
I would like________to the party last night but I had to work extra hours to finish a report.
Have you got________books for the train journey?