-You mustn't swim here. Look at the sign. It_______ "No swimming".-Oh, I_______ notice it. Thanks for telling me.
—Would your younger brother go for a picnic this Sunday?—If I don’t go, _______.
I won’t leave my office until my work _______.
__ your help, we can finish the task in time.
—Look at the boy running on the ground. Is it Davis?—It ______ be him. I saw him go to the teacher’s office just now.
When I returned to my hometown, I was nearly lost. Almost ______had changed.