We have ________ lessons like Music, Art and PE.

I don’t hear the song clearly. Please turn_____the radio.[ ]

Do you think yesterday’s math problem was difficult? —Yes. I could ________ work it out.

What’s wrong with your coat?——Just now when I wanted to get off the bus, the man next to me _______ on it.

The workers are trying to ________ what’s wrong with the machine.