—Have you started writing your report?—Not yet.I _______ a hard time getting the information.
The loss has not yet been ______ accurately, but it is believed to be well beyond a hundred million dollars.
—Why does the lake smell terrible? —Because large quantities of water in the lake .
John plays basketball well, _______his favorite sport is badminton.
The day________ he was looking forward________ in the end.
—Who ________ it be that is knocking at the door? —It________ be Mother, but I’m not sure.