15. Yesterday, a policeman came and explained to us                       to act andwhere to get help in emergencies.

To consider an idea or a suggestion before deciding to accept it is to                       .

The bamboo used to make conical hats must be split into very thin strings and then put into water                    they can avoid tearing and any breakage.

In the central park, there is a statue                from a single block of marble.

Cigarettes                               at a bakery.

The local government suggested                    a road through the Nam Cat Tien National Park.

D.fortress