Choose the right words to complete the sentences.

Choose the correct option.

Can they [turn|turning|turns|turned] on the light?
They can [riding|to ride|ride|rode] horses.
Mr Black can't [hear|hearing|hears|heard] anything because he is deaf.
Birds can [flying|flies|flew|fly] high.
Jess can't [understanding|to understand|understand|understands] Spanish.