—Has your father returned from Europe yet?
—Yes, but he ______ here for only three days before his company sent him to America.
A．was B．has been C．will be D．would be
She started studying medicine at college, but ______ to Business Studies in her second year.
A．transformed B．skipped C．adjusted D．switched
If water becomes increasingly scarce in decades ______, water shortage will become a hot issue all over the world.
A．coming B．having come C．to come D．to be coming
The elderly need special care in winter, as they are ______ to the sudden change of weather.
A．sensitive B．negative C．flexible D．sensible
—We’ll take the conditions into careful consideration ______ you have attached to this contract.
—Thanks. Hope for further cooperation.
A．as B．which C．where D．what
The story is moving, and the questions, I suppose, are not so difficult as they appear ______.
A．to answer B．to be answered C．answering D．being answered
