____once a year by fire officials, whether a school is large of small, is a regulation that must be carried out in this country.
—Do you have _____ trouble finishing the work? —The work is not so difficult as you think. We have finished it already.
I simply couldn’t understand how it _____ that you did so much work within such a short time.
I don’t think she will come to the meeting on time, ______?
—Could I speak to Miss Smith, please? —______. She’s gone to the post office.
Two more people in Shanghai have been ________ to be infected with the deadly H7N9 bird flu, local authorities said on Sunday.