It’s dangerous to let children ride in the passenger's seat.
Putting your feet on a table is bad manners.
The man saw that the woman’s bicycle was completely destroyed so he offered to give her a ride back to town.
This word consists of kanji with hiragana attached. Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means ride so this word has to do with riding. There's another word that's similar (乗る which means to ride). This particular one means to give a ride. Use the せ as a hint. The せ is a "sail" (せ) that you use on your boat to give someone a ride. How nice of you.
The reading is kun'yomi (see that hiragana?) but that's the reading you learned with the kanji so you should be okay with this. Allow me to give you a ride to the next item to study.