—Howmanycomputers_____inyourclassroom?
—Therearetwo.
_____isadoctor.Whatabout_____father?
I’mtenyearsoldandmysisteristwoyearsolderthanme，sosheist_____yearsold。
don't(完全形式)__________
There__________acatandtwodogsinmyhome
Therearetwo_____inourschool
