Choose the sentences which are correct. You will lose points for choosing sentences which are incorrect.

Sheila’s staying in bed because she has a cold.
Steve doesn’t need your help.
What do they think of your idea?
Who did discover the planet Venus?
Everyone loves your website.
Something’s wrong with the car. It makes a strange noise.
Have Jim read this book before?
Are you understanding what I’m saying?
Where does Luigi come? Is it Switzerland?
Did you shared this video with all your friends?
Who did you speak to?
What means "joke"?
Who knows Fiona?
I go to the gym at least once a week.
No, sorry, Dana isn’t here. She jogs in the park.