There are some spelling mistakes in your composition,butyour composition is good [ ]

I have seen trees, _____ open at sunrise and close at sunset.

______ is your father Does he still work as an engineer –Yes, he has been an engineer for thirty years.

small, the company has about 1000 buyers in over30 countries.

You are under 18 years old, so it is for you to join the Trailwalker.