---Are you _________ of the dark? ---Yes, so I always go to sleep with my bedroom lights __________ .

--What's the     of the mountain?--It's 2,000 meters high. 

 —________is a boat ticket for children?—How old is your child? It’s free for kids under three years old.

---How can I improve my reading?---I think the most important is to ______ a good habit of reading.

—Look at the monkeys running around on the rocks together. —Yes, the environment ______ to suit them very well. Let's see the tigers now.