---Excuse me. Where is your teachers’ office?---________, sir.---Thanks a lot.
Thanks ________the nice photo ________your family.
— Is this __________classroom? — Yes, it’s________.
—________do you spell computer? —C-O-M-P-U-T-E-R.
—Are these buses? —________________.
— This is my ruler. _________ the blue pens? — They are Helen’s.