I have learned that a large new building will be set up__________the Twin Towers once stood.—So have I.But the American people haven’t yet got over the shock of September 11.

The doctor said jokingly that his own infection of the virus _______ the discovery of a vaccine (疫苗)of the disease.

The washing machine is of excellent quality. If there __________ be any problem within the first three years, we would fix it for free.

This is such a letter ____came last night．

She has already tried her best. Please don’t be too ________ about her job.[ ]