1. ...................extensively by persons who cannot speak or hear, American Sign Language ranks as the fourth most widely used language in the U.S today.
A. Relied on
B. It is relied on
C. Relying on it
D. To rely on it
2. For thousand of years, people have used vast amounts of wood for building and.................their homes.
A. they hear
B. to heat
C. heating
D. heat
1. A
2. C
1, B
2, C