UnScramble this Word: s r s h m c t a i?

Questions

Natural gas has no?

Penicillin causes about ________ deaths in the United States every year?

Forget-me-not pollen grains are so small that _______ of them can fit on the head of a pin?

The sale of lawn mowers got a great boost when lawn tennis came into vogue in England in?

Skydivers accelerate to a terminal velocity of ______ mph?