The old professor has three sons，________are doctors.
| A．all of them | B．all of whom |
| C．all of that | D．all of which |
Many students’ failure ____ their carelessness in every examination.
| A．takes in | B．gets in | C．lies in | D．turns in |
After leaving college, Mike was employed in an international company and _____ there ever since.
| A．worked | B．has worked | C．had worked | D．was working |
The weather in London is so changeable that people always take their umbrellas with them _____ rain.
| A．in case of | B．in need of | C．in spite of | D．in favor of |
There is no _____ that taking regular physical exercise is good for your heart.
| A．need | B．sense | C．worry | D．doubt |
Without ____electricity, how can we search for information on ____Internet?
| A．/; a | B．/; the | C．the; the | D．the; a |