1. Some students are studying in the classroom, _________________ (灯开着).
2. In 2014, a lot of new rules which benefit the public will soon _________________ (开始存在).
3. Police were called out to keep at the airport, and _________________ (检查即将到达的飞机).
4. _________________ (有了很大变化) in my hometown since 1978.
5. There is a _________________ (激烈的比赛) to join the Special Branch.
