In some cities the traffic police use computers to keep the traffic________smoothly.

The direct flight has proved successful，________ Taiwan another tourist destination for people on the mainland.

 _____ from the table, he made a suggestion that we _____some money for those who suffered a great loss in the terrible earthquakes.  

______around the university, we then were taken to a building, ______ many scientists worked.

Each of the students, working hard at his or her lessons,___to go to university.” “So do I.”