— Mum, would you please buy me an ipad?— If you can help do the dishes the whole vacation, you ______ have one as a reward.

— Mum, can I watch TV now? — No, you             . It's too late.

— Who’s singing in the next room?— It ____ be her . She has gone to New York.

(2013·湖南长沙四校二模)—Is the letter from your mother?—Yes.But she ________the letter herself，because she doesn’t even know one word.

─ Is the woman in white our manager?  ─ It ________be her. She has just left for Shanghai.