The impact of Einstein’s breakthrough in the field of photo electric effect ____ the understanding of the universe was simply tremendous.
| A．in | B．on | C．with | D．about |
—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 |