Alexander Graham Bell invented ___ telephone in 1876.
| A．/ | B．a | C．the | D．one |
Tom is keen _____ surfing the Internet in his spare time.
| A．at | B．on | C．to | D．in |
The students were completely _____ in their reading.
| A．absorbing | B．being absorbed | C．to absorb | D．absorbed |
She missed the plane, _____ driving very fast to the airport.
| A．unless | B．despite | C．though | D．without |
My brother is really _____. He often works in his office far into the night.
| A．open-minded | B．hard-working | C．self-confident | D．warm-hearted |
There is ____ universal concept among ____ parents that the more they feed their kids, the healthier they will grow up to be.
| A．an, the | B．a, the | C．a, / | D．/, the |