The People‘s Republic of China was__________in 1949．
A. found
B. founded
C. built
D. put up
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I wonderon sale．
A. how much cost these shoes
B. how much do these shoes cost
C. how much these shoes cost
D. how much are these shoes cost
We have already built two tunnelswe can get across the big river．
A. which
B. on which
C. by which
D. through which
I don’t regret__________ her what I thought，even if it upset her．
A. to tell
B. telling
C. tell
D. told
Einstein’s__________of relativity explains the motion of moving objects．
A. idea
B. concept
C. theory
D. thiriking
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