This product is popular nationwide.

Students from all over the country will participate in this contest.

We are working on the construction of a new system.

We are working hard to build a new system.

The government announced a new education policy.

Learning how to use English articles is difficult.

He used to work in an ancient government office.

We are under 24-hour surveillance.

We observed the phenomenon all night long.

The patrol boat is patrolling the sea area.