By the time he was ten,Edison______experiments in chemistry.
I arrived late; I ________ the road to be so icy.
Some countries are increasing their use of natural gas, and other forms of ________.
All the employees except the manager ________ to work online at home.
–Which share is meant for me? --You can take ________ half. They’re exactly the same.
We don’t doubt ________ he can do a good job.