I'm having trouble with this one​

2. you__turn left on a red light if you are in the left-most lane of a one-way street, you're turning into the left-most lane of a one-way street, and no nearby sign prohibits the turn.

An empty fuel tank can still contain and therefore can be even more dangerous than one full of liquid fuel.

The number to the right of an element's symbol (ex. c-12) identifies the of an isotope.