Answer:
Strengthening the muscles that support your shoulder will help keep your shoulder joint stable. Keeping these muscles strong can relieve shoulder pain and prevent further injury. Flexibility: Stretching the muscles that you strengthen is important for restoring range of motion and preventing injury.
Explanation:
We have often heard her singing & often seen her dancing.
☆ Use the connector 'and(&)' to connect these type of sentences.

D. With caution against ill use, science can give us great knowledge and progress.
I think that it would be fragment but I am not sure.
I think it is because you need them to separate