党的十九大提出,到2050年把我国建设成富强民主文明和谐（)的社会主义现代化强国。
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____ is covered with heavy snow.
A. The earth's surface
B. The surface of earth
C. The surface earth
D. The earth surface
If I were to do it, I ___ it in a different way.
A. shall do
B. will do
C. would do
D. have done
The policeman told the boys ___ football in this park.
A. not playing
B. not play
C. not to play
D. to not play
_______ useful book it is!
A. What an
B. How a
C. What a
D. What
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