.He is really incompetent! The letter ______ yesterday.a. should be finished typing b. must be finished typingc.must have finished typing d. should have been finished typing
—Putting on a happy face not only helps us make friends but also makes us feel better. —_________.
Aunt Wu is all right ______ her bigger feet.
My sister ______ interested in math after ______ long talk with her last September.
He hurried to the school only _______ the campus was empty ___ it was Sunday!.
How he _______ get out of the prison ______ a mystery.