2. B
3. A
4. D
5. C

四、
1. There are no bones in the back of elephants' feet.
2. Amy usually stops for breakfast on her way to school.
3. Lucy and I decided to put up a tent near the lake.
4. I can feed my rabbit some carrots.
5.  It is really dangerous for children to swim in the river.

2. B
3. A
4. D
5. C

四、
1. There are no bones in the back of elephants' feet.
2. Amy usually stops for breakfast on her way to school.
3. Lucy and I decided to put up a tent near the lake.
4. I can feed my rabbit some carrots.
5.  It is really dangerous for children to swim in the river.