— I drove to Zhuhai for the air show last week.— Is that _________ you had a few days off?
The father as well as his three children___skating on the frozen river every Sunday afternoon in winter
In that school,French and Russian are optional,but English is___for all students
Not only___the data fed into it,but it can also analyze them
___so as to make our city green
___prevent cheating,the test questions are kept secret