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About 71% of the earth’s surface ______ covered with water, but 20% of the world population ______ have access to safe drinking water.
| A．is; doesn’t | B．are; don’t | C．are; doesn’t | D．is; don’t |
I don’t like the way ______ you speak to your mother.
| A．which | B．in that | C．by which | D．/ |
_______ is known to everybody, the moon travels around the earth once a month. .
| A．It | B．As | C．That | D．What |
My father and his teacher talked a lot about the things and persons ___ they could remember.
| A．who | B．which | C．what | D．that |
About ________ of the workers in that steel factory_______ young people.
| A．third-fifths ; are | B．three-fifths ; are | C．three-fives ; is | D．three-fifth ; is |
What an important part the Internet_______ in our life! One can hardly imagine____ life would be like without it.
| A．has; how | B．is; however | C．uses; what | D．plays; what |