More sample arguments

What premise can you add to validly connect the stated premise to the conclusion?

Remember, you want it to begin with an 'all' or 'any' or be an 'if, then" AND you want it to be a general premise, not particular to the first premise. 

1. Dogs are four-legged.

C. Therefore, dogs run fast. 

1. Drugs are dangerous.

C. Therefore, drugs should be illegal. 

1. I want a billion dollars.

C. Therefore, I should get a billion dollars. 

Answers below! No peeking until you have done the problems yourself!

1. Dogs are four-legged.

2. All four-legged animals run fast. (or) Anything four-legged runs fast. (or) If something has four-legs, then it runs fast. 

C. Therefore, dogs run fast. 

1. Drugs are dangerous.

2. If something is dangerous, then it should be illegal. (or) All dangerous things should be illegal. (or) Anything dangerous should be illegal. 

C. Therefore, drugs should be illegal. 

1. I want a billion dollars.

2. If I want something, I should get it. (or) Anything I want, I should get. (or) All things I want I should get. 

C. Therefore, I should get a billion dollars. 

Are these arguments sound? Why or why not?