—Sir,could you please put out your cigarette?This is a smoke-free(无烟的)school.—________.
Sally sings pretty _______ and she is also _______ at dancing.
—Excuse me, can you give me a _______? —Sure.
--- Is this _____computer game? --- Yes, ___is ____computer game.
-- “Your English is very good!” -- “____________ ”
--- _____do you spell “ruler”? --- R—U---L—E —R.