—Who should be responsible for the accident?—The boss, not the workers. They just carry the orders________.
Our classroom is very clean. Do you know who___cleaned it?
—— Was that the new comer who walked by? —— _____.
____being March 12th, they planted trees on the hill.
—— Have you ever seen a whale alive? —— Yes, I’ve seen ___.
____four years since I joined the army.