1.   Cellular phone companies can use the information to determine the optimal spots for new towers, problematic in hilly countries like Colombia or Ecuador.

2.   In hilly country, that can mean extra wear on the brakes.

3.   Q. In hilly country with no well-defined horizon, how are the times of sunrise and sunset established?

4.   The area has a low-stress ambiance, offering extremely pretty skiing in the hilly country north of Lebanon, near the Vermont border.

5.   The GM test track in Milford is harder to protect because it is in hilly country.

6.   The route runs through the hilly country of Western Massachusetts, passing through Huntington, Chester, Becket, and Dalton, and up the Westfield River Gorge.

7.   The town is carved out of the hilly forested country east of Manchester and includes the Uncanoonuc Mountains.

8.   We were in the Apennines heading northeast from Arezzo toward the Adriatic, hilly country with a lot of little towns whose names start altitudinously with Monte.

9.   The buildup of government forces is occurring in hilly densely wooded country that makes troop movements and concentrations hard to spot.

10.   The cause of the crash was unknown although witnesses said that the plane went down in hilly country near Apia in strong winds and heavy rain.